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security: document intentional absence of PR head ref in pull_request_target checkouts #855

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security: document intentional absence of PR head ref in pull_request_target checkouts #855

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security: document why PR head ref is intentionally absent in monorep…
Copilot Jul 28, 2026
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Merge pull request #3 from inkeep/main
kmarekspartz Jul 28, 2026
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11 changes: 11 additions & 0 deletions .github/workflows/monorepo-pr-bridge.yml
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Expand Up @@ -49,6 +49,12 @@ jobs:
runs-on: ubuntu-latest
timeout-minutes: 15
steps:
# SECURITY: Do NOT add `ref: ${{ github.event.pull_request.head.sha }}` here.
# pull_request_target runs in the base-branch context with access to
# repository secrets. Checking out PR head code would allow any PR
# author's scripts (e.g. .github/scripts/bridge-public-pr-to-monorepo.mjs)
# to execute with OSS_SYNC_APP credentials, enabling exfiltration of or
# writes to inkeep/agents-private. Intentionally omitted; keep it that way.
- name: Checkout public repo automation
uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
with:
Expand Down Expand Up @@ -120,6 +126,11 @@ jobs:
runs-on: ubuntu-latest
timeout-minutes: 15
steps:
# SECURITY: Do NOT add `ref: ${{ github.event.pull_request.head.sha }}` here.
# Same rationale as the sync job above: pull_request_target runs in the
# base-branch context with access to repository secrets, so checking out
# PR head code here would allow any PR author's scripts to execute with
# OSS_SYNC_APP credentials. Intentionally omitted; keep it that way.
- name: Checkout public repo automation
uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
with:
Expand Down