CVE-2026-66877

HIGH 8.1

Gitea fork workflow approval bypass through concurrency cancellation

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

Gitea enforces first-time fork contributor approval by blocking jobs, but some job transition and dispatch paths do not re-check the run's approval requirement. A separate run sharing a job-level concurrency group can cancel a pending job and cause its blocked sibling jobs to be re-emitted and dispatched without approval. This allows unreviewed workflow code to execute on self-hosted runners; fork secrets remain withheld and the run token remains read-only.

Vendor	gitea
Product	gitea
Published	Oct 14, 2026
Last Updated	Oct 14, 2026

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Affected Versions

Gitea / Gitea

0 ≤ 1.27.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-gitea/gitea/security/advisories/GHSA-v2w8-m4gr-qj65 blog.gitea.com: https://blog.gitea.com/release-of-1.27.3/ github.com: https://github.com/go-gitea/gitea/pull/39005 github.com: https://github.com/go-gitea/gitea/pull/39018 github.com: https://github.com/go-gitea/gitea/releases/tag/v1.27.3

Credits

🔍 https://github.com/klydz https://github.com/bircni