diff --git a/.github/workflows/gemini-review.yml b/.github/workflows/gemini-review.yml
index 252d4130..20183fc8 100644
--- a/.github/workflows/gemini-review.yml
+++ b/.github/workflows/gemini-review.yml
@@ -33,8 +33,9 @@ jobs:
         uses: 'google-github-actions/run-gemini-cli@v0' # ratchet:exclude
         id: 'gemini_pr_review'
         env:
-          ISSUE_TITLE: '${{ github.event.pull_request.title || github.event.issue.title }}'
-          ISSUE_BODY: '${{ github.event.pull_request.body || github.event.issue.body }}'
+          # ISSUE_TITLE and ISSUE_BODY intentionally omitted: passing raw GitHub event
+          # content directly as env vars is a prompt-injection vector. The gemini-cli
+          # agent must fetch issue/PR content via the GitHub API using PULL_REQUEST_NUMBER.
           PULL_REQUEST_NUMBER: '${{ github.event.pull_request.number || github.event.issue.number }}'
           PR_OWNER: 'google'
           PR_REPO: 'secops-wrapper'
diff --git a/.github/workflows/integration_test.yml b/.github/workflows/integration_test.yml
index 24dac492..f19ef223 100644
--- a/.github/workflows/integration_test.yml
+++ b/.github/workflows/integration_test.yml
@@ -33,7 +33,7 @@ jobs:
       has_sha: ${{ steps.extract-sha.outputs.result != '' }}
       
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
       
       - name: Extract commit SHA from comment
         id: extract-sha
@@ -195,12 +195,12 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
         with:
           ref: ${{ needs.check-authorization.outputs.commit_sha }}
       
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
         with:
           python-version: '3.11'
           cache: 'pip'
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 5526e33e..10a2c577 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -16,10 +16,10 @@ jobs:
     
     steps:
     - name: Check out repository code
-      uses: actions/checkout@v6
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
     
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
       with:
         python-version: '3.10'
         cache: 'pip'
diff --git a/.github/workflows/publish-pypi.yml b/.github/workflows/publish-pypi.yml
index 3e859aa5..8e22d4c5 100644
--- a/.github/workflows/publish-pypi.yml
+++ b/.github/workflows/publish-pypi.yml
@@ -26,12 +26,12 @@ jobs:
     
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
         with:
           fetch-depth: 0  # Full history for changelog generation
       
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
         with:
           python-version: '3.11'
       
@@ -264,10 +264,10 @@ jobs:
     
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
       
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
         with:
           python-version: '3.11'
       
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a6dad170..793b6b3f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,10 +20,10 @@ jobs:
     
     steps:
     - name: Check out repository code
-      uses: actions/checkout@v6
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
     
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6
       with:
         python-version: ${{ matrix.python-version }}
         cache: 'pip'