CVE-2026-66877

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.

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