diff --git a/.github/workflows/security-app.yaml b/.github/workflows/security-app.yaml
new file mode 100644
index 0000000000..17daaa989e
--- /dev/null
+++ b/.github/workflows/security-app.yaml
@@ -0,0 +1,82 @@
+name: Security App
+
+on:
+  workflow_call:
+    inputs:
+      ref:
+        type: string
+        default: 5.3.0
+        required: false
+      project:
+        type: string
+        required: true
+  schedule:
+    # Weekly on Monday at 00:00 UTC
+    - cron: 0 0 * * 1
+
+jobs:
+  dependency-scan-api:
+    if: github.event_name == 'schedule' || inputs.project == 'api'
+    name: API
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: app/api
+    env:
+      # Temporary until this repository becomes a mono-repository: https://dvsa.atlassian.net/browse/VOL-4961.
+      REMOTE_REPOSITORY: dvsa/olcs-backend
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: ${{ env.REMOTE_REPOSITORY }}
+          path: app/api
+      - name: Setup Snyk
+        uses: snyk/actions/setup@master
+      - name: Scan api repository
+        run: snyk test
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+
+  dependency-scan-selfserve:
+    if: github.event_name == 'schedule' || inputs.project == 'selfserve'
+    name: Selfserve
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: app/selfserve
+    env:
+      # Temporary until this repository becomes a mono-repository: https://dvsa.atlassian.net/browse/VOL-4961.
+      REMOTE_REPOSITORY: dvsa/olcs-selfserve
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: ${{ env.REMOTE_REPOSITORY }}
+          path: app/selfserve
+      - name: Setup Snyk
+        uses: snyk/actions/setup@master
+      - name: Scan selfserve repository
+        run: snyk test
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+
+  dependency-scan-internal:
+    if: github.event_name == 'schedule' || inputs.project == 'internal'
+    name: Internal
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: app/internal
+    env:
+      # Temporary until this repository becomes a mono-repository: https://dvsa.atlassian.net/browse/VOL-4961.
+      REMOTE_REPOSITORY: dvsa/olcs-internal
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: ${{ env.REMOTE_REPOSITORY }}
+          path: app/internal
+      - name: Setup Snyk
+        uses: snyk/actions/setup@master
+      - name: Scan internal repository
+        run: snyk test
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}