diff --git a/.github/actions/grype-report/action.yml b/.github/actions/grype-report/action.yml
new file mode 100644
index 0000000..af34948
--- /dev/null
+++ b/.github/actions/grype-report/action.yml
@@ -0,0 +1,58 @@
+name: Grype report
+description: >
+  Collect the grype-* artifacts of this run, write a one-row-per-image summary to the
+  job log and step summary, and post one de-duplicated digest to Slack when any image
+  has findings. Run it in a job with `if: always()` so a critical finding that failed a
+  scan job is still reported. Needs a prior checkout of this repository.
+
+inputs:
+  results:
+    description: Newline-separated <label>=<job-result> pairs, one per expected scan.
+    required: true
+  slack_webhook_url:
+    description: Slack incoming webhook. When empty, the Slack post is skipped.
+    required: false
+    default: ''
+  context:
+    description: Text shown in the Slack message (workflow name and branch).
+    required: false
+    default: ''
+
+runs:
+  using: composite
+  steps:
+    - name: Download Grype reports
+      uses: actions/download-artifact@v4
+      with:
+        pattern: grype-*
+        path: grype-reports
+      # A scan that never produced a report has no artifact; the summary reports that
+      # as "did not complete" rather than failing here.
+      continue-on-error: true
+    - name: Summarize scan results
+      shell: bash
+      env:
+        RESULTS: ${{ inputs.results }}
+      run: |
+        mkdir -p grype-reports
+        mapfile -t pairs < <(printf '%s\n' "$RESULTS" | sed '/^[[:space:]]*$/d')
+        "${{ github.action_path }}/../../scripts/grype-scan-summary.sh" grype-reports "${pairs[@]}" \
+          | tee -a "$GITHUB_STEP_SUMMARY"
+    - name: Post digest to Slack
+      if: ${{ inputs.slack_webhook_url != '' }}
+      shell: bash
+      env:
+        SLACK_WEBHOOK_URL: ${{ inputs.slack_webhook_url }}
+        RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+        REF: ${{ inputs.context }}
+      run: |
+        payload="$("${{ github.action_path }}/../../scripts/grype-slack-digest.sh" grype-reports)"
+        if [ -z "$payload" ]; then
+          echo "No Grype findings in any image; nothing to post."
+          exit 0
+        fi
+        curl -sSf -X POST -H 'Content-type: application/json' --data "$payload" "$SLACK_WEBHOOK_URL"
+    - name: Note skipped Slack post
+      if: ${{ inputs.slack_webhook_url == '' }}
+      shell: bash
+      run: echo "::notice::No Slack webhook available (secret unset, or a fork PR); skipping the Slack digest."
diff --git a/.github/actions/grype-scan/action.yml b/.github/actions/grype-scan/action.yml
new file mode 100644
index 0000000..2e09dfc
--- /dev/null
+++ b/.github/actions/grype-scan/action.yml
@@ -0,0 +1,49 @@
+name: Grype scan
+description: >
+  Scan one container image with Grype, print the findings sorted by package then
+  severity, and upload the JSON report (1-day retention) for the run's digest.
+  Fails on a critical finding, but the report is always uploaded first.
+
+inputs:
+  image:
+    description: Image reference to scan (a local tag or a registry reference).
+    required: true
+  label:
+    description: Unique label for this scan; names the uploaded artifact grype-<label>.
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Install Grype
+      shell: bash
+      run: curl -sSfL https://raw.githubusercontent.com/anchore/grype/main/install.sh | sh -s -- -b /usr/local/bin
+    - name: Scan vulnerabilities with Grype
+      shell: bash
+      env:
+        IMAGE: ${{ inputs.image }}
+        LABEL: ${{ inputs.label }}
+      # Grype's --sort-by takes a single strategy (package OR severity), so scan to
+      # JSON and print the table ourselves: package name, then severity (worst first),
+      # then vulnerability ID. The exit code still comes from grype's --fail-on.
+      run: |
+        mkdir -p "grype-out/$LABEL"
+        rc=0
+        grype -o "json=grype-out/$LABEL/grype.json" --fail-on critical --only-fixed "$IMAGE" || rc=$?
+        if [ -s "grype-out/$LABEL/grype.json" ]; then
+          jq -r '
+            def rank: {"Critical":0,"High":1,"Medium":2,"Low":3,"Negligible":4}[.] // 5;
+            (["PACKAGE","INSTALLED","FIXED IN","TYPE","VULNERABILITY","SEVERITY"] | @tsv),
+            (.matches | sort_by([.artifact.name, (.vulnerability.severity | rank), .vulnerability.id])[]
+             | [.artifact.name, .artifact.version, ((.vulnerability.fix.versions // []) | join(", ")), .artifact.type, .vulnerability.id, .vulnerability.severity] | @tsv)
+          ' "grype-out/$LABEL/grype.json" | column -t -s "$(printf '\t')"
+        fi
+        exit "$rc"
+    - name: Upload Grype report
+      if: ${{ always() }}
+      uses: actions/upload-artifact@v4
+      with:
+        name: grype-${{ inputs.label }}
+        path: grype-out/${{ inputs.label }}/grype.json
+        if-no-files-found: ignore
+        retention-days: 1
diff --git a/.github/scripts/grype-scan-summary.sh b/.github/scripts/grype-scan-summary.sh
new file mode 100755
index 0000000..fa8fdf9
--- /dev/null
+++ b/.github/scripts/grype-scan-summary.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Print a Markdown table with one row per scanned image, so a run always shows that
+# every scan finished and what it found, including the all-clear case.
+#
+# Usage: grype-scan-summary.sh <dir> <label>=<job-result> ...
+#   <dir>/grype-<label>/grype.json   report per image (download-artifact layout)
+#   <job-result>                     the scan job's needs.<job>.result
+#
+# Status per image:
+#   no report / job did not succeed -> scan did not complete (never shown as clean)
+#   report with no matches          -> no findings
+#   report with matches             -> findings, counted by severity
+set -euo pipefail
+
+dir="${1:?usage: $0 <dir> <label>=<result>...}"
+shift
+
+echo "### Grype scan results"
+echo
+echo "| Image | Result |"
+echo "| --- | --- |"
+for pair in "$@"; do
+  label="${pair%%=*}"
+  result="${pair#*=}"
+  report="$dir/grype-$label/grype.json"
+  if [ ! -s "$report" ]; then
+    status="❌ scan did not complete (no report; job ${result})"
+  else
+    count="$(jq '.matches | length' "$report")"
+    if [ "$count" -eq 0 ]; then
+      status="✅ No findings"
+    else
+      detail="$(jq -r 'def rank: {"Critical":0,"High":1,"Medium":2,"Low":3,"Negligible":4}[.] // 5;
+                .matches | group_by(.vulnerability.severity)
+                | sort_by(.[0].vulnerability.severity | rank)
+                | map("\(length) \(.[0].vulnerability.severity)") | join(", ")' "$report")"
+      status="⚠️ ${count} findings (${detail})"
+    fi
+  fi
+  echo "| \`${label}\` | ${status} |"
+done
diff --git a/.github/workflows/container-validation.yml b/.github/workflows/container-validation.yml
index 8f57b27..970a872 100644
--- a/.github/workflows/container-validation.yml
+++ b/.github/workflows/container-validation.yml
@@ -71,32 +71,20 @@ jobs:
       - simplerisk-minimal-php84
       - simplerisk-minimal-php85
     runs-on: ubuntu-latest
-    env:
-      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
-      - name: Download Grype reports
-        if: ${{ env.SLACK_WEBHOOK_URL != '' }}
-        uses: actions/download-artifact@v4
+      - name: Report Grype results
+        uses: ./.github/actions/grype-report
         with:
-          pattern: grype-*
-          path: grype-reports
-      - name: Post digest to Slack
-        if: ${{ env.SLACK_WEBHOOK_URL != '' }}
-        env:
-          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
-          REF: ${{ github.head_ref || github.ref_name }}
-        run: |
-          payload="$(./.github/scripts/grype-slack-digest.sh grype-reports)"
-          if [ -z "$payload" ]; then
-            echo "No Grype findings in any image; nothing to post."
-            exit 0
-          fi
-          curl -sSf -X POST -H 'Content-type: application/json' --data "$payload" "$SLACK_WEBHOOK_URL"
-      - name: Note skipped post
-        if: ${{ env.SLACK_WEBHOOK_URL == '' }}
-        run: echo "::notice::SLACK_WEBHOOK_URL is not available (unset, or a fork PR); skipping the Slack digest."
+          slack_webhook_url: ${{ secrets.SLACK_WEBHOOK_URL }}
+          context: ${{ github.workflow }} · ${{ github.head_ref || github.ref_name }}
+          results: |
+            jammy=${{ needs.simplerisk-jammy.result }}
+            noble=${{ needs.simplerisk-noble.result }}
+            minimal-php83=${{ needs.simplerisk-minimal-php83.result }}
+            minimal-php84=${{ needs.simplerisk-minimal-php84.result }}
+            minimal-php85=${{ needs.simplerisk-minimal-php85.result }}
 
   generator_checks:
     name: 'Verify the Dockerfile generators (version/source-mode decoupling)'
diff --git a/.github/workflows/publish-testing.yml b/.github/workflows/publish-testing.yml
index 4d63c49..516e94d 100644
--- a/.github/workflows/publish-testing.yml
+++ b/.github/workflows/publish-testing.yml
@@ -182,6 +182,37 @@ jobs:
           cache-from: type=gha,scope=minimal-testing-php85
           cache-to: type=gha,mode=max,scope=minimal-testing-php85
 
+      # Scan the images exactly as published, BEFORE the SSM promote below rolls them
+      # out to tier=testing customers. Each scan is continue-on-error so all three
+      # reports are produced and uploaded; the gate step then fails the job (and so
+      # skips the promote) if any of them hit a critical finding.
+      - name: Scan php83 (published)
+        id: scan83
+        continue-on-error: true
+        uses: ./.github/actions/grype-scan
+        with:
+          image: ${{ env.IMAGE_NAME }}:${{ needs.resolve.outputs.version }}-php83
+          label: published-minimal-php83
+      - name: Scan php84 (published)
+        id: scan84
+        continue-on-error: true
+        uses: ./.github/actions/grype-scan
+        with:
+          image: ${{ env.IMAGE_NAME }}:${{ needs.resolve.outputs.version }}-php84
+          label: published-minimal-php84
+      - name: Scan php85 (published)
+        id: scan85
+        continue-on-error: true
+        uses: ./.github/actions/grype-scan
+        with:
+          image: ${{ env.IMAGE_NAME }}:${{ needs.resolve.outputs.version }}-php85
+          label: published-minimal-php85
+      - name: Block the promote on critical findings
+        if: ${{ steps.scan83.outcome == 'failure' || steps.scan84.outcome == 'failure' || steps.scan85.outcome == 'failure' }}
+        run: |
+          echo "::error::Grype found critical vulnerabilities in the published images; not promoting to the testing tier. See the scan steps above."
+          exit 1
+
       - name: Configure AWS credentials (OIDC → customers account)
         uses: aws-actions/configure-aws-credentials@v4
         with:
@@ -283,3 +314,47 @@ jobs:
             ${{ env.FULL_IMAGE_NAME }}:testing
           cache-from: type=gha,scope=full-testing-noble
           cache-to: type=gha,mode=max,scope=full-testing-noble
+
+      - name: Scan jammy (published)
+        id: scanjammy
+        continue-on-error: true
+        uses: ./.github/actions/grype-scan
+        with:
+          image: ${{ env.FULL_IMAGE_NAME }}:${{ needs.resolve.outputs.version }}-jammy
+          label: published-full-jammy
+      - name: Scan noble (published)
+        id: scannoble
+        continue-on-error: true
+        uses: ./.github/actions/grype-scan
+        with:
+          image: ${{ env.FULL_IMAGE_NAME }}:${{ needs.resolve.outputs.version }}-noble
+          label: published-full-noble
+      - name: Fail on critical findings
+        if: ${{ steps.scanjammy.outcome == 'failure' || steps.scannoble.outcome == 'failure' }}
+        run: |
+          echo "::error::Grype found critical vulnerabilities in the published full-stack images."
+          exit 1
+
+  grype_report:
+    name: Report Grype results for the published images
+    # always(): a critical finding fails a publish job (and blocks the promote), and
+    # that is exactly when the report matters.
+    if: ${{ always() }}
+    needs: [publish, publish-full]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout (docker@testing)
+        uses: actions/checkout@v6
+      - name: Report Grype results
+        uses: ./.github/actions/grype-report
+        with:
+          slack_webhook_url: ${{ secrets.SLACK_WEBHOOK_URL }}
+          context: ${{ github.workflow }} · ${{ github.ref_name }}
+          results: |
+            published-minimal-php83=${{ needs.publish.result }}
+            published-minimal-php84=${{ needs.publish.result }}
+            published-minimal-php85=${{ needs.publish.result }}
+            published-full-jammy=${{ needs.publish-full.result }}
+            published-full-noble=${{ needs.publish-full.result }}
diff --git a/.github/workflows/scheduled-grype-scan.yml b/.github/workflows/scheduled-grype-scan.yml
new file mode 100644
index 0000000..8d13025
--- /dev/null
+++ b/.github/workflows/scheduled-grype-scan.yml
@@ -0,0 +1,56 @@
+name: Weekly Grype scan of the published testing images
+
+# Images do not change between publishes, but the vulnerability database does. This
+# scans the CURRENT published :testing images once a week so a CVE disclosed after
+# publish still reaches the Slack channel. It is the only scan that notices that.
+
+on:
+  schedule:
+    - cron: '0 13 * * 1'   # Mondays 13:00 UTC
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  scan-minimal:
+    name: 'Scan simplerisk/simplerisk-minimal:testing'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+      - name: Scan vulnerabilities with Grype
+        uses: ./.github/actions/grype-scan
+        with:
+          image: simplerisk/simplerisk-minimal:testing
+          label: testing-minimal
+
+  scan-full:
+    name: 'Scan simplerisk/simplerisk:testing'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+      - name: Scan vulnerabilities with Grype
+        uses: ./.github/actions/grype-scan
+        with:
+          image: simplerisk/simplerisk:testing
+          label: testing-full
+
+  report:
+    name: 'Report Grype results'
+    # always(): a critical finding fails a scan job, and that is when this matters.
+    if: ${{ always() }}
+    needs: [scan-minimal, scan-full]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+      - name: Report Grype results
+        uses: ./.github/actions/grype-report
+        with:
+          slack_webhook_url: ${{ secrets.SLACK_WEBHOOK_URL }}
+          context: ${{ github.workflow }} · testing
+          results: |
+            testing-minimal=${{ needs.scan-minimal.result }}
+            testing-full=${{ needs.scan-full.result }}
diff --git a/.github/workflows/verify-image_rw.yml b/.github/workflows/verify-image_rw.yml
index c1dc34b..6e4e8c4 100644
--- a/.github/workflows/verify-image_rw.yml
+++ b/.github/workflows/verify-image_rw.yml
@@ -38,29 +38,8 @@ jobs:
           image: ${{ inputs.image_tag }}
           failure-threshold: FATAL
           dockle-host: "unix:///var/run/docker.sock"
-      - name: Install Grype
-        run: curl -sSfL https://raw.githubusercontent.com/anchore/grype/main/install.sh | sh -s -- -b /usr/local/bin
       - name: Scan vulnerabilities with Grype
-        # Grype's --sort-by takes a single strategy (package OR severity), so scan to
-        # JSON and print the table ourselves: package name, then severity (worst first),
-        # then vulnerability ID. The exit code still comes from grype's --fail-on.
-        run: |
-          rc=0
-          grype -o json=grype.json --fail-on critical --only-fixed ${{ inputs.image_tag }} || rc=$?
-          if [ -s grype.json ]; then
-            jq -r '
-              def rank: {"Critical":0,"High":1,"Medium":2,"Low":3,"Negligible":4}[.] // 5;
-              (["PACKAGE","INSTALLED","FIXED IN","TYPE","VULNERABILITY","SEVERITY"] | @tsv),
-              (.matches | sort_by([.artifact.name, (.vulnerability.severity | rank), .vulnerability.id])[]
-               | [.artifact.name, .artifact.version, ((.vulnerability.fix.versions // []) | join(", ")), .artifact.type, .vulnerability.id, .vulnerability.severity] | @tsv)
-            ' grype.json | column -t -s "$(printf '\t')"
-          fi
-          exit "$rc"
-      - name: Upload Grype report
-        if: ${{ always() }}
-        uses: actions/upload-artifact@v4
+        uses: ./.github/actions/grype-scan
         with:
-          name: grype-${{ inputs.scan_label }}
-          path: grype.json
-          if-no-files-found: ignore
-          retention-days: 1
+          image: ${{ inputs.image_tag }}
+          label: ${{ inputs.scan_label }}