diff --git a/roles/svc-db-elasticsearch/tasks/main.yml b/roles/svc-db-elasticsearch/tasks/main.yml
index 395e6136a6..9548b6b757 100644
--- a/roles/svc-db-elasticsearch/tasks/main.yml
+++ b/roles/svc-db-elasticsearch/tasks/main.yml
@@ -3,6 +3,8 @@
   when: run_once_svc_db_elasticsearch is not defined
   vars:
     application_id: svc-db-elasticsearch
+  environment:
+    ELASTIC_PW: "{{ ELASTICSEARCH_PASSWORD }}"
 
 - include_tasks: utils/load/handlers.yml
   vars:
@@ -11,3 +13,5 @@
 - name: "🎬 Initialize dedicated index namespace"
   include_tasks: 01_init.yml
   when: database_init | bool
+  environment:
+    ELASTIC_PW: "{{ ELASTICSEARCH_PASSWORD }}"
diff --git a/roles/svc-db-elasticsearch/vars/main.yml b/roles/svc-db-elasticsearch/vars/main.yml
index f1fbaaf9c8..86076cdf04 100644
--- a/roles/svc-db-elasticsearch/vars/main.yml
+++ b/roles/svc-db-elasticsearch/vars/main.yml
@@ -14,4 +14,4 @@ ELASTICSEARCH_HEAP_MB: "{{ lookup('service_memory_mb', application_id, entity_na
 ELASTICSEARCH_RETRIES: 5
 ELASTICSEARCH_DELAY: 2
 ELASTICSEARCH_API_BASE: "http://{{ ELASTICSEARCH_LOCAL_HOST }}:{{ ELASTICSEARCH_INTERNAL_PORT }}"
-ELASTICSEARCH_EXEC_SHELL: "container exec -e ELASTIC_PW={{ ELASTICSEARCH_PASSWORD | quote }} {{ ELASTICSEARCH_CONTAINER_ADDRESS }} sh -lc"
+ELASTICSEARCH_EXEC_SHELL: "container exec -e ELASTIC_PW {{ ELASTICSEARCH_CONTAINER_ADDRESS }} sh -lc"
diff --git a/roles/svc-db-mariadb/files/test/test.sh b/roles/svc-db-mariadb/files/test/test.sh
index 3a450320eb..3142d2e647 100644
--- a/roles/svc-db-mariadb/files/test/test.sh
+++ b/roles/svc-db-mariadb/files/test/test.sh
@@ -28,11 +28,12 @@ SLEEP_SECONDS="${SLEEP_SECONDS:-15}"
 
 DB_PASSWORD="$(printf '%s' "${DB_PASSWORD_B64}" | base64 -d 2>/dev/null)"
 [ -n "${DB_PASSWORD}" ] || { echo "[FATAL] DB_PASSWORD_B64 missing or undecodable" >&2; exit 2; }
+export MYSQL_PWD="${DB_PASSWORD}"
 
 # Local: authenticate inside the container over TCP (127.0.0.1) so the server
 # enforces password auth — a genuine credential check.
 auth_local() {
-	container exec -e MYSQL_PWD="${DB_PASSWORD}" "${DB_CONTAINER}" \
+	container exec -e MYSQL_PWD "${DB_CONTAINER}" \
 		mariadb -h 127.0.0.1 -u "${DB_USER}" -N -B -e 'SELECT 1' 2>/dev/null |
 		grep -qx 1
 }
diff --git a/roles/svc-db-postgres/files/shell/set_postgres_superuser_password.sh b/roles/svc-db-postgres/files/shell/set_postgres_superuser_password.sh
index 1571cdac4e..6e1093c302 100644
--- a/roles/svc-db-postgres/files/shell/set_postgres_superuser_password.sh
+++ b/roles/svc-db-postgres/files/shell/set_postgres_superuser_password.sh
@@ -2,7 +2,10 @@
 set -euo pipefail
 
 # Usage:
-#   set_postgres_superuser_password.sh <container_name> <new_password> <role>
+#   set_postgres_superuser_password.sh <container_name> <role>
+#   POSTGRES_SUPERUSER_PASSWORD: the password to write, read from the
+#   environment only, so it reaches neither this script's argv nor that of the
+#   container exec calls it makes.
 #
 # The role is the cluster's superuser: "postgres" for the shared engine, and
 # whatever POSTGRES_USER a dedicated one was initialised with. Both are reached
@@ -11,14 +14,22 @@ set -euo pipefail
 # written into an engine nobody can log into any more.
 
 container_raw="${1:-}"
-new_pw="${2:-}"
-role="${3:-}"
+role="${2:-}"
+new_pw="${POSTGRES_SUPERUSER_PASSWORD:-}"
 
-if [[ -z "$container_raw" || -z "$new_pw" || -z "$role" ]]; then
-  echo "Usage: $0 <container_name> <new_password> <role>" >&2
+if [[ -z "$container_raw" || -z "$role" ]]; then
+  echo "Usage: $0 <container_name> <role>" >&2
   exit 2
 fi
 
+if [[ -z "$new_pw" ]]; then
+  echo "[FAIL] POSTGRES_SUPERUSER_PASSWORD is empty; refusing to set an empty password." >&2
+  exit 1
+fi
+
+export PGPASSWORD="$new_pw"
+export NEW_POSTGRES_PASSWORD="$new_pw"
+
 container=""
 eval "container=$container_raw"
 
@@ -31,7 +42,7 @@ pg_exec() {
 auth_test() {
   for _ in {1..15}; do
     # shellcheck disable=SC2016
-    if container exec -e PGPASSWORD="$new_pw" -e PG_ROLE="$role" "$container" bash -lc \
+    if container exec -e PGPASSWORD -e PG_ROLE="$role" "$container" bash -lc \
         'psql -h 127.0.0.1 -p 5432 -U "$PG_ROLE" -d postgres -Atc "SELECT 1" >/dev/null 2>&1'; then
       return 0
     fi
@@ -81,7 +92,7 @@ for _ in {1..30}; do
   if auth_test; then pre_ok=1; fi
 
   # shellcheck disable=SC2016
-  if ! container exec -e NEW_POSTGRES_PASSWORD="$new_pw" -e PG_ROLE="$role" "$container" bash -lc '
+  if ! container exec -e NEW_POSTGRES_PASSWORD -e PG_ROLE="$role" "$container" bash -lc '
     psql -U "$PG_ROLE" -d postgres -v ON_ERROR_STOP=1 -v role="$PG_ROLE" -v password="$NEW_POSTGRES_PASSWORD" <<'"'"'SQL'"'"'
 ALTER USER :"role" WITH PASSWORD :'"'"'password'"'"';
 SQL
diff --git a/roles/svc-db-postgres/files/test/test.sh b/roles/svc-db-postgres/files/test/test.sh
index 87f706cbf3..416cc534a0 100644
--- a/roles/svc-db-postgres/files/test/test.sh
+++ b/roles/svc-db-postgres/files/test/test.sh
@@ -29,11 +29,12 @@ SLEEP_SECONDS="${SLEEP_SECONDS:-15}"
 
 DB_PASSWORD="$(printf '%s' "${DB_PASSWORD_B64}" | base64 -d 2>/dev/null)"
 [ -n "${DB_PASSWORD}" ] || { echo "[FATAL] DB_PASSWORD_B64 missing or undecodable" >&2; exit 2; }
+export PGPASSWORD="${DB_PASSWORD}"
 
 # Local: authenticate inside the container over TCP (127.0.0.1) so pg_hba
 # enforces password auth — a genuine credential check, not a peer/trust socket.
 auth_local() {
-	container exec -e PGPASSWORD="${DB_PASSWORD}" "${DB_CONTAINER}" \
+	container exec -e PGPASSWORD "${DB_CONTAINER}" \
 		psql -h 127.0.0.1 -U "${DB_USER}" -d "${DB_NAME}" -Atqc 'SELECT 1' 2>/dev/null |
 		grep -qx 1
 }
diff --git a/roles/svc-db-postgres/tasks/00_core.yml b/roles/svc-db-postgres/tasks/00_core.yml
index 8e1c9fa77c..5013604c73 100644
--- a/roles/svc-db-postgres/tasks/00_core.yml
+++ b/roles/svc-db-postgres/tasks/00_core.yml
@@ -42,7 +42,9 @@
 
 - name: "✅ POSTGRES | Ensure postgres superuser password matches inventory"
   ansible.builtin.script: > # nocheck: container-address-quote script evals the fragment itself
-    shell/set_postgres_superuser_password.sh {{ POSTGRES_CONTAINER_ADDRESS | quote }} {{ POSTGRES_PASSWORD | quote }} postgres
+    shell/set_postgres_superuser_password.sh {{ POSTGRES_CONTAINER_ADDRESS | quote }} postgres
+  environment:
+    POSTGRES_SUPERUSER_PASSWORD: "{{ POSTGRES_PASSWORD }}"
   register: postgres_pw_result
   delegate_to: "{{ STACK_HOST }}"
   run_once: true
diff --git a/roles/svc-db-postgres/tasks/01_init.yml b/roles/svc-db-postgres/tasks/01_init.yml
index ad258a13c8..4c02f96af1 100644
--- a/roles/svc-db-postgres/tasks/01_init.yml
+++ b/roles/svc-db-postgres/tasks/01_init.yml
@@ -25,9 +25,11 @@
     - name: ⏳ Wait for Postgres TCP auth
       no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
       ansible.builtin.shell: > # nocheck: container-exec-resolver  POSTGRES_LOCAL_CID resolved at delegate_to runtime
-        container exec -e PGPASSWORD={{ POSTGRES_PASSWORD | quote }} {{ POSTGRES_LOCAL_CID | quote }} sh -lc
+        container exec -e PGPASSWORD {{ POSTGRES_LOCAL_CID | quote }} sh -lc
         'psql -h "{{ POSTGRES_LOCAL_HOST }}" -p "{{ POSTGRES_PORT }}"
         -U postgres -d postgres -c "SELECT 1"'
+      environment:
+        PGPASSWORD: "{{ POSTGRES_PASSWORD }}"
       delegate_to: "{{ POSTGRES_HOST_NODE }}"
       register: pg_ready
       until: pg_ready.rc == 0
diff --git a/roles/svc-db-rabbitmq/tasks/01_init.yml b/roles/svc-db-rabbitmq/tasks/01_init.yml
index d0fcc2e1a3..49d4a6b15c 100644
--- a/roles/svc-db-rabbitmq/tasks/01_init.yml
+++ b/roles/svc-db-rabbitmq/tasks/01_init.yml
@@ -58,8 +58,10 @@
 
 - name: "📁 Create user: {{ rabbitmq_consumer_username }}"
   ansible.builtin.shell: >
-    container exec -e RMQ_PW={{ rabbitmq_consumer_password | quote }} {{ RABBITMQ_CONTAINER_ADDRESS }} sh -lc
+    container exec -e RMQ_PW {{ RABBITMQ_CONTAINER_ADDRESS }} sh -lc
     'rabbitmqctl -q add_user {{ rabbitmq_consumer_username | quote }} "$RMQ_PW"'
+  environment:
+    RMQ_PW: "{{ rabbitmq_consumer_password }}"
   register: rmq_add_user
   changed_when: rmq_add_user.rc == 0
   retries: "{{ RABBITMQ_RETRIES }}"
@@ -70,8 +72,10 @@
 
 - name: "✅ Ensure user password matches inventory: {{ rabbitmq_consumer_username }}"
   ansible.builtin.shell: >
-    container exec -e RMQ_PW={{ rabbitmq_consumer_password | quote }} {{ RABBITMQ_CONTAINER_ADDRESS }} sh -lc
+    container exec -e RMQ_PW {{ RABBITMQ_CONTAINER_ADDRESS }} sh -lc
     'rabbitmqctl -q change_password {{ rabbitmq_consumer_username | quote }} "$RMQ_PW"'
+  environment:
+    RMQ_PW: "{{ rabbitmq_consumer_password }}"
   register: rmq_change_password
   changed_when: false
   retries: "{{ RABBITMQ_RETRIES }}"
diff --git a/roles/svc-db-redis/tasks/01_init.yml b/roles/svc-db-redis/tasks/01_init.yml
index 97546042fd..025c30f43e 100644
--- a/roles/svc-db-redis/tasks/01_init.yml
+++ b/roles/svc-db-redis/tasks/01_init.yml
@@ -47,13 +47,15 @@
 - name: "🔧 REDIS | Provision ACL user {{ redis_acl_username }} (auth-isolated)"
   ansible.builtin.shell: >
     container exec
-    -e REDIS_ACL_PASSWORD={{ redis_acl_password | quote }}
+    -e REDIS_ACL_PASSWORD
     {{ REDIS_CONTAINER_ADDRESS }} sh -lc
     '{{ REDIS_CLI }} ACL SETUSER {{ redis_acl_username }}
     on resetkeys resetchannels
     ">$REDIS_ACL_PASSWORD"
     allkeys allchannels
     +@all'
+  environment:
+    REDIS_ACL_PASSWORD: "{{ redis_acl_password }}"
   register: redis_acl_set
   until: redis_acl_set.rc == 0
   retries: "{{ REDIS_RETRIES }}"
diff --git a/roles/sys-svc-rdbms/tasks/utils/realign_dedicated_db.yml b/roles/sys-svc-rdbms/tasks/utils/realign_dedicated_db.yml
index 92eb25ac8e..7ffea172d1 100644
--- a/roles/sys-svc-rdbms/tasks/utils/realign_dedicated_db.yml
+++ b/roles/sys-svc-rdbms/tasks/utils/realign_dedicated_db.yml
@@ -28,8 +28,9 @@
           ansible.builtin.script: > # nocheck: container-address-quote script evals the fragment itself
             {{ lookup('path_absolute', 'roles/svc-db-postgres/files/shell/set_postgres_superuser_password.sh') }}
             {{ lookup('database', application_id, 'container') | quote }}
-            {{ lookup('database', application_id, 'password') | quote }}
             {{ lookup('database', application_id, 'username') | quote }}
+          environment:
+            POSTGRES_SUPERUSER_PASSWORD: "{{ lookup('database', application_id, 'password') }}"
           register: _app_db_realign
           no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
           changed_when: _app_db_realign.stdout is search('\\[CHANGED\\]')
diff --git a/roles/web-app-checkmk/tasks/01_manager_ops.yml b/roles/web-app-checkmk/tasks/01_manager_ops.yml
index d660b4aae8..3c7a4410da 100644
--- a/roles/web-app-checkmk/tasks/01_manager_ops.yml
+++ b/roles/web-app-checkmk/tasks/01_manager_ops.yml
@@ -53,13 +53,15 @@
       -e LDAP_SERVER={{ CHECKMK_LDAP_SERVER | quote }}
       -e LDAP_PORT={{ CHECKMK_LDAP_PORT | quote }}
       -e LDAP_BIND_DN={{ CHECKMK_LDAP_BIND_DN | quote }}
-      -e LDAP_BIND_PASSWORD={{ CHECKMK_LDAP_BIND_PASSWORD | quote }}
+      -e LDAP_BIND_PASSWORD
       -e LDAP_USER_DN={{ CHECKMK_LDAP_USER_DN | quote }}
       -e LDAP_GROUP_DN={{ CHECKMK_LDAP_GROUP_DN | quote }}
       -e LDAP_UID_ATTR={{ CHECKMK_LDAP_USER_ID_ATTR | quote }}
       {{ CHECKMK_LOCAL_CID | quote }}
       bash -s
     stdin: "{{ lookup('file', 'shell/configure-sso.sh') }}"
+  environment:
+    LDAP_BIND_PASSWORD: "{{ CHECKMK_LDAP_BIND_PASSWORD }}"
   delegate_to: "{{ CHECKMK_HOST_NODE }}"
   when: (CHECKMK_SSO_ENABLED | bool) or (CHECKMK_LDAP_ENABLED | bool)
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
diff --git a/roles/web-app-decidim/tasks/01_setup.yml b/roles/web-app-decidim/tasks/01_setup.yml
index 538143cba1..0b4e40ccab 100644
--- a/roles/web-app-decidim/tasks/01_setup.yml
+++ b/roles/web-app-decidim/tasks/01_setup.yml
@@ -77,11 +77,13 @@
   ansible.builtin.shell: > # nocheck: container-exec-resolver  DECIDIM_LOCAL_CID resolved at delegate_to runtime
     container exec -i -e RAILS_ENV={{ ENVIRONMENT | quote }}
     -e DECIDIM_ADMIN_EMAIL={{ lookup('users', 'platform_administrator').email | quote }}
-    -e DECIDIM_ADMIN_PASSWORD={{ lookup('users', 'platform_administrator').password | quote }}
+    -e DECIDIM_ADMIN_PASSWORD
     {{ DECIDIM_LOCAL_CID | quote }}
     bundle exec rails runner -
   args:
     stdin: "{{ lookup('file', 'ruby/ensure/admin_user.rb') }}"
+  environment:
+    DECIDIM_ADMIN_PASSWORD: "{{ lookup('users', 'platform_administrator').password }}"
   register: decidim_admin_result
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
   changed_when: "'Admin user ready' in decidim_admin_result.stdout"
diff --git a/roles/web-app-espocrm/tasks/01_patch_config.yml b/roles/web-app-espocrm/tasks/01_patch_config.yml
index 3a1b4111fe..970c539189 100644
--- a/roles/web-app-espocrm/tasks/01_patch_config.yml
+++ b/roles/web-app-espocrm/tasks/01_patch_config.yml
@@ -3,11 +3,13 @@
   ansible.builtin.shell:
     cmd: >-
       container exec -i --user root
-      -e CONFIG_KEY={{ item.key }}
-      -e CONFIG_VALUE={{ item.value | quote }}
-      -e CONFIG_FILE={{ ESPOCRM_CONFIG_FILE_PRIVATE | quote }}
+      -e CONFIG_KEY -e CONFIG_VALUE -e CONFIG_FILE
       {{ ESPOCRM_LOCAL_CID | quote }} sh
     stdin: "{{ lookup('file', 'shell/patch_config_key.sh') }}"
+  environment:
+    CONFIG_KEY: "{{ item.key }}"
+    CONFIG_VALUE: "{{ item.value }}"
+    CONFIG_FILE: "{{ ESPOCRM_CONFIG_FILE_PRIVATE }}"
   loop:
     - { key: host, value: "{{ lookup('database', application_id, 'host') }}" }
     - { key: dbname, value: "{{ lookup('database', application_id, 'name') }}" }
diff --git a/roles/web-app-friendica/tasks/utils/patch/config.yml b/roles/web-app-friendica/tasks/utils/patch/config.yml
index 5f0bc0e29d..ef560b6498 100644
--- a/roles/web-app-friendica/tasks/utils/patch/config.yml
+++ b/roles/web-app-friendica/tasks/utils/patch/config.yml
@@ -14,8 +14,10 @@
 - name: 🩹 Patch Friendica local.config.php (DB password)
   shell: >
     container exec --user {{ FRIENDICA_USER }}
-    -e PATCH_PASSWORD={{ lookup('database', application_id, 'password') | sed_escape('/') | quote }}
+    -e PATCH_PASSWORD
     {{ FRIENDICA_LOCAL_CID | quote }}
     sh -c "sed -ri -e \"s/('password'\\s*=>\\s*')[^']*(',)/\\1\${PATCH_PASSWORD}\\2/\" {{ FRIENDICA_CONFIG_FILE }}"
+  environment:
+    PATCH_PASSWORD: "{{ lookup('database', application_id, 'password') | sed_escape('/') }}"
   delegate_to: "{{ FRIENDICA_HOST_NODE }}"
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
diff --git a/roles/web-app-joomla/tasks/05_patch.yml b/roles/web-app-joomla/tasks/05_patch.yml
index 858fed6455..9b1505c080 100644
--- a/roles/web-app-joomla/tasks/05_patch.yml
+++ b/roles/web-app-joomla/tasks/05_patch.yml
@@ -7,11 +7,13 @@
     -e J_DBTYPE={{ JOOMLA_DB_CONNECTOR | quote }}
     -e J_DBHOST={{ (lookup('database', application_id, 'host') ~ ':' ~ lookup('database', application_id, 'port')) | quote }}
     -e J_DBUSER={{ lookup('database', application_id, 'username') | quote }}
-    -e J_DBPASS={{ lookup('database', application_id, 'password') | quote }}
+    -e J_DBPASS
     -e J_DBNAME={{ lookup('database', application_id, 'name') | quote }}
     {{ JOOMLA_LOCAL_CID | quote }} php --
   args:
     stdin: "{{ lookup('file', role_path ~ '/files/php/configure_db.php') }}"
+  environment:
+    J_DBPASS: "{{ lookup('database', application_id, 'password') }}"
   register: cfg_patch
   changed_when: cfg_patch.stdout == "changed"
   failed_when: cfg_patch.rc != 0
diff --git a/roles/web-app-mailu/tasks/03_wait_for_mariadb.yml b/roles/web-app-mailu/tasks/03_wait_for_mariadb.yml
index 8d113eb805..5ddf68fbdf 100644
--- a/roles/web-app-mailu/tasks/03_wait_for_mariadb.yml
+++ b/roles/web-app-mailu/tasks/03_wait_for_mariadb.yml
@@ -17,10 +17,12 @@
 - name: "🔎 Check for Mailu DB domain table"
   ansible.builtin.shell: > # nocheck: container-exec-resolver  MAILU_DB_LOCAL_CID resolved at delegate_to runtime
     container exec
-    -e MARIADB_PWD={{ lookup('database', application_id, 'password') | quote }}
+    -e MARIADB_PWD
     {{ MAILU_DB_LOCAL_CID | quote }} sh -c
     'mariadb -u {{ lookup('database', application_id, 'username') }} -p"$MARIADB_PWD"
     -e "SHOW TABLES FROM {{ lookup('database', application_id, 'name') }} LIKE \"domain\";"'
+  environment:
+    MARIADB_PWD: "{{ lookup('database', application_id, 'password') }}"
   register: mailu_db_schema_check
   retries: 30
   delay: 5
diff --git a/roles/web-app-matrix/tasks/flavor/compose/utils/realign_synapse_password.yml b/roles/web-app-matrix/tasks/flavor/compose/utils/realign_synapse_password.yml
index 40ba1ffbb3..ef7dec73d3 100644
--- a/roles/web-app-matrix/tasks/flavor/compose/utils/realign_synapse_password.yml
+++ b/roles/web-app-matrix/tasks/flavor/compose/utils/realign_synapse_password.yml
@@ -14,7 +14,7 @@
 - name: "🔑 Point {{ realign_localpart }} at the declared password"
   ansible.builtin.shell:
     cmd: >-
-      container exec -i -e PGPASSWORD={{ MATRIX_POSTGRES_PASSWORD | quote }}
+      container exec -i -e PGPASSWORD
       {{ lookup('database', application_id, 'address') }}
       psql -v ON_ERROR_STOP=1 -U {{ MATRIX_POSTGRES_USER | quote }}
       -d {{ MATRIX_POSTGRES_DATABASE | quote }}
@@ -24,5 +24,7 @@
     stdin: >-
       {{ lookup('file', 'sql/realign_user_password.sql') }}
     executable: /bin/bash
+  environment:
+    PGPASSWORD: "{{ MATRIX_POSTGRES_PASSWORD }}"
   register: matrix_password_update
   changed_when: "'UPDATE 1' in matrix_password_update.stdout"
diff --git a/roles/web-app-moodle/tasks/utils/ai_gateway.yml b/roles/web-app-moodle/tasks/utils/ai_gateway.yml
index 55832a8079..531408605a 100644
--- a/roles/web-app-moodle/tasks/utils/ai_gateway.yml
+++ b/roles/web-app-moodle/tasks/utils/ai_gateway.yml
@@ -7,13 +7,15 @@
     container exec -i --user {{ MOODLE_RUNTIME_USER }}
     -e MOODLE_CONFIG={{ MOODLE_CONFIG | quote }}
     -e AI_PROVIDER_NAME={{ MOODLE_LITELLM_PROVIDER_NAME | quote }}
-    -e AI_API_KEY={{ MOODLE_LITELLM_API_KEY | quote }}
+    -e AI_API_KEY
     -e AI_CHAT_ENDPOINT={{ MOODLE_LITELLM_CHAT_ENDPOINT | quote }}
     -e AI_CHAT_MODEL={{ LITELLM_CHAT_MODEL | quote }}
     -e AI_IMAGE_ENDPOINT={{ MOODLE_LITELLM_IMAGE_ENDPOINT | quote }}
     {{ MOODLE_CONTAINER_ADDRESS }} php
   args:
     stdin: "{{ lookup('file', 'php/provision/ai_gateway.php') }}"
+  environment:
+    AI_API_KEY: "{{ MOODLE_LITELLM_API_KEY }}"
   register: moodle_ai_provider
   changed_when: false
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
diff --git a/roles/web-app-moodle/tasks/utils/mcp/provision.yml b/roles/web-app-moodle/tasks/utils/mcp/provision.yml
index 725661b800..b85ea4b362 100644
--- a/roles/web-app-moodle/tasks/utils/mcp/provision.yml
+++ b/roles/web-app-moodle/tasks/utils/mcp/provision.yml
@@ -8,13 +8,15 @@
       -e MCP_SERVICE_FUNCTIONS={{ MOODLE_MCP_EXTERNAL_FUNCTIONS | join(',') | quote }} \
       -e MCP_ACCOUNT_USERNAME={{ MOODLE_MCP_ACCOUNT_USERNAME | quote }} \
       -e MCP_ACCOUNT_EMAIL={{ MOODLE_MCP_ACCOUNT_EMAIL | quote }} \
-      -e MCP_ACCOUNT_PASSWORD={{ MOODLE_MCP_ACCOUNT_PASSWORD | quote }} \
+      -e MCP_ACCOUNT_PASSWORD \
       -e MCP_ROLE_SHORTNAME={{ MOODLE_MCP_ROLE_SHORTNAME | quote }} \
       -e MCP_ROLE_NAME={{ MOODLE_MCP_ROLE_NAME | quote }} \
       -e MCP_ROLE_CAPABILITIES={{ MOODLE_MCP_ROLE_CAPABILITIES | join(',') | quote }} \
       {{ MOODLE_MCP_LOCAL_CID | quote }} php
   args:
     stdin: "{{ lookup('file', 'php/provision/mcp.php') }}"
+  environment:
+    MCP_ACCOUNT_PASSWORD: "{{ MOODLE_MCP_ACCOUNT_PASSWORD }}"
   register: moodle_mcp_provision
   changed_when: false
   delegate_to: "{{ MOODLE_MCP_HOST_NODE }}"
diff --git a/roles/web-app-nextcloud/files/shell/realign_admin_password.sh b/roles/web-app-nextcloud/files/shell/realign_admin_password.sh
index a929300ef8..21dd4b335c 100644
--- a/roles/web-app-nextcloud/files/shell/realign_admin_password.sh
+++ b/roles/web-app-nextcloud/files/shell/realign_admin_password.sh
@@ -33,7 +33,7 @@ if [[ "$current_sha" == "$declared_sha" ]]; then
   exit 0
 fi
 
-if ! container exec -u "$run_as" -e "OC_PASS=$OC_PASS" "$container" \
+if ! container exec -u "$run_as" -e OC_PASS "$container" \
   php "$occ" user:resetpassword --password-from-env "$admin_user" >/dev/null; then
   echo "[FAIL] occ user:resetpassword failed for '$admin_user'." >&2
   exit 1
diff --git a/roles/web-app-nextcloud/tasks/addons/integration_openproject_provision.yml b/roles/web-app-nextcloud/tasks/addons/integration_openproject_provision.yml
index f572a43585..227828be7d 100644
--- a/roles/web-app-nextcloud/tasks/addons/integration_openproject_provision.yml
+++ b/roles/web-app-nextcloud/tasks/addons/integration_openproject_provision.yml
@@ -22,10 +22,12 @@
       container exec -i
       -e NEXTCLOUD_HOST={{ lookup('tls', 'web-app-nextcloud', 'url.base') | quote }}
       -e STORAGE_NAME={{ nextcloud_op_storage_name | quote }}
-      -e NC_HAS_OP_SECRET={{ nextcloud_op_client_secret_current.stdout | trim | quote }}
+      -e NC_HAS_OP_SECRET
       {{ NEXTCLOUD_OPENPROJECT_LOCAL_CID | quote }}
       bash -lc 'cd /app && bundle exec rails runner -'
     stdin: "{{ lookup('file', 'ruby/utils/doorkeeper_allow_onion_redirect.rb') ~ '\n' ~ lookup('file', 'ruby/addons/openproject/ensure_nextcloud_storage.rb') }}"
+  environment:
+    NC_HAS_OP_SECRET: "{{ nextcloud_op_client_secret_current.stdout | trim }}"
   delegate_to: "{{ NEXTCLOUD_OPENPROJECT_HOST_NODE }}"
   register: nextcloud_op_storage_create
   changed_when: "'\"oauth_application_created\":true' in nextcloud_op_storage_create.stdout"
@@ -99,11 +101,13 @@
           -e NEXTCLOUD_HOST={{ lookup('tls', 'web-app-nextcloud', 'url.base') | quote }}
           -e STORAGE_NAME={{ nextcloud_op_storage_name | quote }}
           -e NC_OAUTH_CLIENT_ID={{ nextcloud_op_ncclient.clientId | quote }}
-          -e NC_OAUTH_CLIENT_SECRET={{ nextcloud_op_ncclient.clientSecret | quote }}
+          -e NC_OAUTH_CLIENT_SECRET
           {{ NEXTCLOUD_OPENPROJECT_LOCAL_CID | quote }}
           bash -lc 'cd /app && bundle exec rails runner -'
         stdin: "{{ lookup('file', 'ruby/utils/doorkeeper_allow_onion_redirect.rb') ~ '\n' ~ lookup('file', 'ruby/addons/openproject/ensure_nextcloud_storage.rb')
           }}"
+      environment:
+        NC_OAUTH_CLIENT_SECRET: "{{ nextcloud_op_ncclient.clientSecret }}"
       delegate_to: "{{ NEXTCLOUD_OPENPROJECT_HOST_NODE }}"
       register: nextcloud_op_client_store
       changed_when: true
diff --git a/roles/web-app-shopware/files/php/oidc/client.php b/roles/web-app-shopware/files/php/oidc/client.php
index aa37e32b7e..369bbd737a 100644
--- a/roles/web-app-shopware/files/php/oidc/client.php
+++ b/roles/web-app-shopware/files/php/oidc/client.php
@@ -6,7 +6,7 @@
  * Runs INSIDE the Shopware web container (piped via
  * `container exec -i ... php < this-file`).
  *
- * Required env, supplied via `container exec -e KEY=VALUE`:
+ * Required env, supplied by the calling task via `container exec -e KEY`:
  *   SHOPWARE_API_BASE   base URL of the Shopware API as seen from the container
  *   ADMIN_USER          admin username for the password grant
  *   ADMIN_PASSWORD      admin password for the password grant
diff --git a/roles/web-app-shopware/files/shell/admin/user.sh b/roles/web-app-shopware/files/shell/admin/user.sh
index efb7d5dc35..ceddea10f3 100644
--- a/roles/web-app-shopware/files/shell/admin/user.sh
+++ b/roles/web-app-shopware/files/shell/admin/user.sh
@@ -4,7 +4,7 @@
 # Runs INSIDE the Shopware web container (piped via
 # `container exec -i ... sh < this-file`).
 #
-# Required env, supplied via `container exec -e KEY=VALUE`:
+# Required env, supplied by the calling task via `container exec -e KEY`:
 #   SHOPWARE_ROOT     absolute path to the Shopware install
 #   ADMIN_USER        username of the admin user
 #   ADMIN_PASSWORD    password to set/enforce
diff --git a/roles/web-app-shopware/tasks/01_admin.yml b/roles/web-app-shopware/tasks/01_admin.yml
index 1c23380779..c1a5ad972e 100644
--- a/roles/web-app-shopware/tasks/01_admin.yml
+++ b/roles/web-app-shopware/tasks/01_admin.yml
@@ -5,13 +5,15 @@
       container exec -i --user {{ SHOPWARE_USER }}
       -e SHOPWARE_ROOT={{ SHOPWARE_ROOT | quote }}
       -e ADMIN_USER={{ lookup('users', 'platform_administrator').username | quote }}
-      -e ADMIN_PASSWORD={{ lookup('users', 'platform_administrator').password | quote }}
+      -e ADMIN_PASSWORD
       -e ADMIN_FIRST_NAME={{ lookup('users', 'platform_administrator').username | quote }}
       -e ADMIN_LAST_NAME={{ DOMAIN_PRIMARY | lower | quote }}
       -e ADMIN_EMAIL={{ lookup('users', 'platform_administrator').email | quote }}
       {{ SHOPWARE_WEB_LOCAL_CID | quote }}
       sh
     stdin: "{{ lookup('ansible.builtin.file', role_path ~ '/files/shell/admin/user.sh') }}"
+  environment:
+    ADMIN_PASSWORD: "{{ lookup('users', 'platform_administrator').password }}"
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
 
 - name: "🛡️ Ensure the Shopware admin still holds the admin privilege"
diff --git a/roles/web-app-shopware/tasks/setup/oidc.yml b/roles/web-app-shopware/tasks/setup/oidc.yml
index b42b68bbd4..5e08e83cb4 100644
--- a/roles/web-app-shopware/tasks/setup/oidc.yml
+++ b/roles/web-app-shopware/tasks/setup/oidc.yml
@@ -22,15 +22,18 @@
       container exec -i --user {{ SHOPWARE_USER }}
       -e SHOPWARE_API_BASE={{ SHOPWARE_API_BASE | quote }}
       -e ADMIN_USER={{ lookup('users', 'platform_administrator').username | quote }}
-      -e ADMIN_PASSWORD={{ lookup('users', 'platform_administrator').password | quote }}
+      -e ADMIN_PASSWORD
       -e OIDC_AUTH_SERVER={{ OIDC.URL | quote }}
       -e OIDC_INTERNAL_BASE={{ SHOPWARE_OIDC_INTERNAL_BASE | quote }}
       -e OIDC_REALM={{ OIDC.CLIENT.REALM | quote }}
       -e OIDC_CLIENT_ID={{ OIDC.CLIENT.ID | quote }}
-      -e OIDC_CLIENT_SECRET={{ OIDC.CLIENT.SECRET | quote }}
+      -e OIDC_CLIENT_SECRET
       {{ SHOPWARE_WEB_LOCAL_CID | quote }}
       php
     stdin: "{{ lookup('ansible.builtin.file', role_path ~ '/files/php/oidc/client.php') }}"
+  environment:
+    ADMIN_PASSWORD: "{{ lookup('users', 'platform_administrator').password }}"
+    OIDC_CLIENT_SECRET: "{{ OIDC.CLIENT.SECRET }}"
   changed_when: false
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
 
diff --git a/roles/web-app-snipe-it/tasks/01_install.yml b/roles/web-app-snipe-it/tasks/01_install.yml
index f3fdf73e21..062566ef97 100644
--- a/roles/web-app-snipe-it/tasks/01_install.yml
+++ b/roles/web-app-snipe-it/tasks/01_install.yml
@@ -25,10 +25,12 @@
 - name: ▶️ Run Snipe-IT migrations (idempotent)
   ansible.builtin.shell: >-
     container exec -i
-    -e APP_KEY="{{ SNIPE_IT_APP_KEY }}"
+    -e APP_KEY
     -e XDG_CONFIG_HOME=/tmp
     {{ SNIPE_IT_CONTAINER_ADDRESS }}
     php artisan migrate --force
+  environment:
+    APP_KEY: "{{ SNIPE_IT_APP_KEY }}"
   register: snipeit_migrate
   changed_when: >
     ('Migrating:' in snipeit_migrate.stdout)
diff --git a/roles/web-app-snipe-it/tasks/02_ldap.yml b/roles/web-app-snipe-it/tasks/02_ldap.yml
index ad55ff4b58..5b493989ef 100644
--- a/roles/web-app-snipe-it/tasks/02_ldap.yml
+++ b/roles/web-app-snipe-it/tasks/02_ldap.yml
@@ -15,11 +15,11 @@
   ansible.builtin.shell:
     cmd: >-
       container exec -i
-      -e APP_KEY={{ SNIPE_IT_APP_KEY | quote }}
+      -e APP_KEY
       -e LDAP_SERVER_URI={{ LDAP.SERVER.URI | quote }}
       -e LDAP_SERVER_PORT={{ LDAP.SERVER.PORT | quote }}
       -e LDAP_BIND_DN={{ LDAP.DN.ADMINISTRATOR.DATA | quote }}
-      -e LDAP_BIND_PASSWORD_B64={{ LDAP.BIND_CREDENTIAL | b64encode | quote }}
+      -e LDAP_BIND_PASSWORD_B64
       -e LDAP_BASEDN={{ LDAP.DN.OU.USERS | quote }}
       -e LDAP_FILTER_USERS_ALL={{ SNIPE_IT_LDAP_FILTER_FRAGMENT | quote }}
       -e LDAP_USER_ID_ATTR={{ LDAP.USER.ATTRIBUTES.ID | quote }}
@@ -30,6 +30,9 @@
       -e OIDC_RESET_URL={{ OIDC.CLIENT.RESET_CREDENTIALS | quote }}
       {{ SNIPE_IT_CONTAINER_ADDRESS }} php
     stdin: "{{ lookup('file', 'php/apply/ldap_config.php') }}"
+  environment:
+    APP_KEY: "{{ SNIPE_IT_APP_KEY }}"
+    LDAP_BIND_PASSWORD_B64: "{{ LDAP.BIND_CREDENTIAL | b64encode }}"
   changed_when: true
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
 
diff --git a/roles/web-app-snipe-it/tasks/03_admin.yml b/roles/web-app-snipe-it/tasks/03_admin.yml
index 4851929947..1cd2e6fb09 100644
--- a/roles/web-app-snipe-it/tasks/03_admin.yml
+++ b/roles/web-app-snipe-it/tasks/03_admin.yml
@@ -2,7 +2,7 @@
 - name: "🔎 Check if Snipe-IT admin user already exists (by username)"
   ansible.builtin.shell: |
     container exec -i \
-      -e APP_KEY="{{ SNIPE_IT_APP_KEY }}" \
+      -e APP_KEY \
       {{ SNIPE_IT_CONTAINER_ADDRESS }} \
       php -r '
         require "vendor/autoload.php";
@@ -13,22 +13,27 @@
           ->exists();
         exit($exists ? 0 : 1);
       '
+  environment:
+    APP_KEY: "{{ SNIPE_IT_APP_KEY }}"
   register: snipe_it_admin_exists
   changed_when: false
   failed_when: false
 
 - name: "📁 Create Snipe-IT administrator account"
-  ansible.builtin.shell: >
-    container exec -i
-    -e APP_KEY="{{ SNIPE_IT_APP_KEY }}"
-    {{ SNIPE_IT_CONTAINER_ADDRESS }}
-    php artisan snipeit:create-admin
-    --first_name "{{ lookup('users', 'platform_administrator').firstname }}"
-    --last_name "{{ lookup('users', 'platform_administrator').lastname }}"
-    --username "{{ lookup('users', 'platform_administrator').username }}"
-    --email "{{ lookup('users', 'platform_administrator').email }}"
-    --password {{ lookup('users', 'platform_administrator').password | quote }}
-    --no-interaction
+  ansible.builtin.shell: |
+    container exec -i -e APP_KEY -e SNIPE_IT_REALIGN_PASSWORD \
+      {{ SNIPE_IT_CONTAINER_ADDRESS }} sh -lc '
+        php artisan snipeit:create-admin \
+          --first_name "{{ lookup('users', 'platform_administrator').firstname }}" \
+          --last_name "{{ lookup('users', 'platform_administrator').lastname }}" \
+          --username "{{ lookup('users', 'platform_administrator').username }}" \
+          --email "{{ lookup('users', 'platform_administrator').email }}" \
+          --password "$SNIPE_IT_REALIGN_PASSWORD" \
+          --no-interaction
+      '
+  environment:
+    APP_KEY: "{{ SNIPE_IT_APP_KEY }}"
+    SNIPE_IT_REALIGN_PASSWORD: "{{ lookup('users', 'platform_administrator').password }}"
   when: snipe_it_admin_exists.rc != 0
   register: snipe_it_admin_create
   changed_when: "'New user created' in snipe_it_admin_create.stdout"
diff --git a/roles/web-app-taiga/files/python/upsert_admin.py b/roles/web-app-taiga/files/python/upsert_admin.py
new file mode 100644
index 0000000000..67700fe1b0
--- /dev/null
+++ b/roles/web-app-taiga/files/python/upsert_admin.py
@@ -0,0 +1,39 @@
+# nocheck: mirrored-unit-test - runs inside `manage.py shell`, against the live
+# Django user model and database; there is nothing to exercise outside it
+"""Bring the Taiga superuser in line with what the deployment declares.
+
+Read on stdin by ``manage.py shell``, which execs it when stdin is not a tty.
+
+Env (from the container):
+    TAIGA_SUPERUSER_NAME      login to upsert
+    TAIGA_SUPERUSER_EMAIL     address the account must carry
+    DJANGO_SUPERUSER_PASSWORD password it must accept afterwards
+
+Prints ``CHANGED=1`` when it wrote anything, ``CHANGED=0`` when the account
+already matched.
+"""
+
+import os
+
+from django.contrib.auth import get_user_model
+
+name = os.environ["TAIGA_SUPERUSER_NAME"]
+email = os.environ["TAIGA_SUPERUSER_EMAIL"]
+password = os.environ["DJANGO_SUPERUSER_PASSWORD"]
+
+User = get_user_model()
+user, created = User.objects.get_or_create(username=name)
+
+before = (user.email, user.is_staff, user.is_superuser, user.is_active)
+user.email = email
+user.is_staff = True
+user.is_superuser = True
+user.is_active = True
+after = (user.email, user.is_staff, user.is_superuser, user.is_active)
+
+needs_password = not user.check_password(password)
+if needs_password:
+    user.set_password(password)
+
+user.save()
+print("CHANGED=1" if created or before != after or needs_password else "CHANGED=0")
diff --git a/roles/web-app-taiga/tasks/01_administrator.yml b/roles/web-app-taiga/tasks/01_administrator.yml
index b00b8f9d88..c83253aa32 100644
--- a/roles/web-app-taiga/tasks/01_administrator.yml
+++ b/roles/web-app-taiga/tasks/01_administrator.yml
@@ -21,11 +21,13 @@
 - name: "📁 Create Taiga admin user (idempotent)"
   ansible.builtin.shell: > # nocheck: container-exec-resolver  runtime-resolved CID, delegated to the hosting node
     container exec -i
-    -e DJANGO_SUPERUSER_PASSWORD={{ TAIGA_SUPERUSER_PASSWORD | quote }}
+    -e DJANGO_SUPERUSER_PASSWORD
     {{ TAIGA_MANAGER_LOCAL_CID | quote }}
     python manage.py createsuperuser --noinput
     --username {{ TAIGA_SUPERUSER_NAME }}
     --email {{ TAIGA_SUPERUSER_EMAIL }}
+  environment:
+    DJANGO_SUPERUSER_PASSWORD: "{{ TAIGA_SUPERUSER_PASSWORD }}"
   register: taiga_create_admin
   delegate_to: "{{ TAIGA_MANAGER_HOST_NODE }}"
   changed_when: taiga_create_admin.rc == 0
@@ -37,15 +39,17 @@
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
 
 - name: "📝 Upsert Taiga admin via manage.py shell"
-  ansible.builtin.shell: > # nocheck: container-exec-resolver  runtime-resolved CID, delegated to the hosting node
-    container exec -i
-    -e DJANGO_SUPERUSER_PASSWORD={{ TAIGA_SUPERUSER_PASSWORD | quote }}
-    {{ TAIGA_MANAGER_LOCAL_CID | quote }}
-    python manage.py shell -c
-    "from django.contrib.auth import get_user_model; import os; U=get_user_model(); u,created=U.objects.get_or_create(username='{{ TAIGA_SUPERUSER_NAME }}'); changed=bool(created);
-    old=(u.email,u.is_staff,u.is_superuser,u.is_active); u.email='{{ TAIGA_SUPERUSER_EMAIL }}'; u.is_staff=True; u.is_superuser=True; u.is_active=True; changed =
-    changed or old!=(u.email,u.is_staff,u.is_superuser,u.is_active); pwd=os.environ.get('DJANGO_SUPERUSER_PASSWORD'); assert pwd, 'Missing DJANGO_SUPERUSER_PASSWORD';
-    need_pwd = not u.check_password(pwd); changed = changed or need_pwd; need_pwd and u.set_password(pwd); u.save(); print('CHANGED=1' if changed else 'CHANGED=0')"
+  ansible.builtin.shell: # nocheck: container-exec-resolver  runtime-resolved CID, delegated to the hosting node
+    cmd: >
+      container exec -i
+      -e TAIGA_SUPERUSER_NAME -e TAIGA_SUPERUSER_EMAIL -e DJANGO_SUPERUSER_PASSWORD
+      {{ TAIGA_MANAGER_LOCAL_CID | quote }}
+      python manage.py shell
+    stdin: "{{ lookup('file', 'python/upsert_admin.py') }}"
+  environment:
+    TAIGA_SUPERUSER_NAME: "{{ TAIGA_SUPERUSER_NAME }}"
+    TAIGA_SUPERUSER_EMAIL: "{{ TAIGA_SUPERUSER_EMAIL }}"
+    DJANGO_SUPERUSER_PASSWORD: "{{ TAIGA_SUPERUSER_PASSWORD }}"
   register: taiga_upsert_admin
   when: taiga_create_admin.rc != 0
   delegate_to: "{{ TAIGA_MANAGER_HOST_NODE }}"
diff --git a/roles/web-app-wordpress/tasks/01_patch_config.yml b/roles/web-app-wordpress/tasks/01_patch_config.yml
index 4fcac0a7df..c4d37c0171 100644
--- a/roles/web-app-wordpress/tasks/01_patch_config.yml
+++ b/roles/web-app-wordpress/tasks/01_patch_config.yml
@@ -30,11 +30,17 @@
   notify: compose-up
 
 - name: 🔄 Update DB password in {{ WORDPRESS_CONFIG_FILE }}
+  # Exception: the backslash in `\${PATCH_PASSWORD}` is load-bearing. The task
+  # environment puts the value in the host shell too, so an unescaped `$` would
+  # expand there and write the password straight back into the container exec
+  # argv, which is the leak this form exists to avoid.
   shell: >
     container exec --user root
-    -e PATCH_PASSWORD={{ lookup('database', application_id, 'password') | sed_escape('/') | quote }}
+    -e PATCH_PASSWORD
     {{ WORDPRESS_CONTAINER_ADDRESS }}
     sh -c "sed -i \"s/define(\\s*'DB_PASSWORD'\\s*,\\s*'[^']*'\\s*);/define( 'DB_PASSWORD', '\${PATCH_PASSWORD}' );/i\" {{ WORDPRESS_DOCKER_CONF_PATH }}"
+  environment:
+    PATCH_PASSWORD: "{{ lookup('database', application_id, 'password') | sed_escape('/') }}"
   notify: compose-up
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
 
diff --git a/tests/lint/ansible/shell/container/test_exec_env_passes_no_value.py b/tests/lint/ansible/shell/container/test_exec_env_passes_no_value.py
new file mode 100644
index 0000000000..54491ddd30
--- /dev/null
+++ b/tests/lint/ansible/shell/container/test_exec_env_passes_no_value.py
@@ -0,0 +1,138 @@
+"""Ban ``-e NAME=VALUE`` in role files wherever VALUE is not a literal.
+
+Rationale
+=========
+``container exec -e NAME=VALUE`` puts VALUE in the argv of the host-side
+process, where ``ps`` shows it to every local account for as long as the call
+runs. ``no_log`` does not help: it masks Ansible's output, not the process
+table. A deployment rotates its credentials between the two passes of a
+matrix-deploy round, so the values that travel this way are live secrets.
+
+The safer form is ``-e NAME`` with no value. The engine then forwards the
+variable from its own environment, which an Ansible task fills with a
+task-level ``environment:`` mapping and a shell script with ``export``.
+
+What that buys, stated exactly, because the reduction is real but partial:
+with ``ansible.builtin.script`` the value reaches no argv at all, since the
+script reads it from an inherited environment. With ``shell`` and ``command``
+it still appears once, on the module wrapper's own command line: ansible-core
+assembles ``NAME='value' /usr/bin/python …`` from ``Shell.env_prefix`` in
+``build_module_command``. The window shrinks from the whole container call,
+re-executed on every pass of an ``until:`` retry loop, to the module's own
+runtime, and the value no longer repeats per retry. It does not vanish.
+
+The check is on the flag, not on the command in front of it. Associating an
+``-e`` with its ``container exec`` is unreliable across a YAML block scalar,
+where the flag sits on its own line with no continuation marker, and it would
+buy nothing: ``docker run -e`` and ``podman exec -e`` leak the value exactly
+the same way.
+
+A literal value cannot carry a secret, so ``-e RAILS_ENV=production`` and
+``-e XDG_CONFIG_HOME=/tmp`` pass. Of the interpolated ones the rule takes
+those that carry a credential, by either of two independent signals: the
+variable's own name, or a credential source in the expression behind it
+(``.password``, ``secrets.credentials.``, a ``'password'`` lookup key, a
+``_SECRET``/``_TOKEN``/``_PW`` variable).
+
+The second signal is what keeps this from being a name denylist, which would
+be no protection on its own: a secret handed over as ``-e FOO={{
+lookup('users', 'x').password }}`` is caught by its source even though its
+name says nothing. What still slips through is a secret from a source this
+rule does not know, under a name that does not say so. Ports, paths and model
+names pass deliberately; they are not worth the churn of moving every
+interpolated value in the repository.
+
+Per-line opt-out
+================
+``# nocheck: container-exec-env-value -- <reason>`` on the same line or the
+immediately preceding non-empty line. Reserved for a templated value that
+provably carries no secret, such as a service or role name; state which.
+"""
+
+from __future__ import annotations
+
+import re
+import unittest
+from pathlib import Path
+
+from utils.annotations.suppress import is_suppressed_at
+from utils.cache.files import iter_project_files_with_content
+
+from . import PROJECT_ROOT
+
+_RULE = "container-exec-env-value"
+_EXTENSIONS = (".yml", ".yaml", ".j2", ".sh")
+_ENV_WITH_VALUE = re.compile(r"(?:^|\s)-e\s+([A-Za-z_][A-Za-z0-9_]*)=")
+_INTERPOLATED = re.compile(r"\{\{|\$|`")
+_SECRET_NAME = re.compile(r"PASS|PWD|SECRET|TOKEN|KEY|CRED", re.IGNORECASE)
+_SECRET_SOURCE = re.compile(
+    r"\.password\b"
+    r"|secrets\.credentials\."
+    r"|['\"]password['\"]"
+    r"|\.secret\b"
+    r"|[A-Za-z0-9_]*(?:PASSWORD|SECRET|TOKEN|_PW|_KEY)\b",
+    re.IGNORECASE,
+)
+
+
+def _is_scan_target(rel_path: str) -> bool:
+    return rel_path.startswith("roles/") and rel_path.endswith(_EXTENSIONS)
+
+
+class TestContainerExecEnvPassesNoValue(unittest.TestCase):
+    def test_container_exec_env_flags_carry_no_value(self) -> None:
+        findings: list[tuple[str, int, str]] = []
+        for path_str, content in iter_project_files_with_content(
+            extensions=_EXTENSIONS
+        ):
+            rel = Path(path_str).relative_to(PROJECT_ROOT).as_posix()
+            if not _is_scan_target(rel):
+                continue
+            lines = content.splitlines()
+            for idx, line in enumerate(lines):
+                if line.lstrip().startswith("#"):
+                    continue
+                matches = list(_ENV_WITH_VALUE.finditer(line))
+                for position, match in enumerate(matches):
+                    following = matches[position + 1 :]
+                    stop = following[0].start() if following else len(line)
+                    name = match.group(1)
+                    value = line[match.end() : stop]
+                    if not _INTERPOLATED.search(value):
+                        continue
+                    if not (
+                        _SECRET_NAME.search(name) or _SECRET_SOURCE.search(value)
+                    ):
+                        continue
+                    line_no = idx + 1
+                    if is_suppressed_at(lines, line_no, _RULE, mode="same-or-above"):
+                        continue
+                    findings.append((rel, line_no, f"-e {name}={value.strip()[:60]}"))
+
+        if findings:
+            formatted = "\n".join(
+                f"- {p}:{ln}: {snip}"
+                for p, ln, snip in sorted(set(findings), key=lambda x: (x[0], x[1]))
+            )
+            self.fail(
+                f"Found {len(set(findings))} `-e NAME=VALUE` flags carrying an "
+                "interpolated value. The value lands in the argv of the "
+                "host-side container call, where `ps` shows it to every local "
+                "account while the call runs, and `no_log` cannot mask a "
+                "process table.\n\n"
+                "Fix one of:\n"
+                "  - pass the name alone, `-e NAME`, and supply the value "
+                "through the task's `environment:` mapping (Ansible) or an "
+                "`export NAME=...` in the script (shell). With `script` the "
+                "value then reaches no argv; with `shell` and `command` it "
+                "appears once on the module wrapper's line instead of on "
+                "every container call;\n"
+                "  - for a templated value that provably carries no secret, "
+                "add `# nocheck: container-exec-env-value -- <reason>` on the "
+                "same line or the line above, naming what the value is.\n\n"
+                f"Offending lines:\n{formatted}"
+            )
+
+
+if __name__ == "__main__":  # pragma: no cover
+    unittest.main()