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ci: declare workflow-level contents: read on 1 workflows#23351

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ci: declare workflow-level contents: read on 1 workflows#23351
arpitjain099 wants to merge 1 commit into
cockroachdb:mainfrom
arpitjain099:chore/declare-workflow-perms-readonly

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Pins the default GITHUB_TOKEN to contents: read on 1 workflows in .github/workflows/ that don't call a GitHub API beyond the initial checkout.

The following files were left implicit because they reference GITHUB_TOKEN / use a write-scope action / trigger on pull_request_target. Those scopes are best declared by maintainers: changed_files.yml, cross-version-links.yml, pr-reviews.yml, validate-branch-existence.yml.

Why

CVE-2025-30066 (March 2025 tj-actions/changed-files supply-chain compromise) exfiltrated GITHUB_TOKEN from workflow logs. Pinning per workflow caps runtime authority irrespective of the repo or org default, gives drift protection if the default ever widens, and is credited per-file by the OpenSSF Scorecard Token-Permissions check.

YAML validated locally with yaml.safe_load on each touched file.

Pins the default GITHUB_TOKEN to contents: read on the workflows in
.github/workflows/ that don't call a GitHub API beyond the initial
checkout. The other workflows in this directory are left implicit
because they need write scopes that a maintainer is better placed
to declare.

Motivation: CVE-2025-30066 (March 2025 tj-actions/changed-files
compromise) exfiltrated GITHUB_TOKEN from workflow logs. Per-workflow
caps bound runtime authority irrespective of repo or org default,
give drift protection if the default ever widens, and are credited
per-file by the OpenSSF Scorecard Token-Permissions check.

YAML validated locally with yaml.safe_load.

Signed-off-by: Arpit Jain <arpitjain099@gmail.com>
@arpitjain099 arpitjain099 requested a review from a team as a code owner May 15, 2026 05:51
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