CVE-2026-66877
Gitea fork workflow approval bypass through concurrency cancellation
- State
- Published
- Severity
- 8.1 High
- Published
- Oct 14, 2026
- Updated
- Oct 15, 2026
- Reserved
- Aug 13, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N | CISA-ADP |
Weaknesses
- CWE-284 Improper Access Control
Affected Products
| Product | Versions |
|---|---|
GiteaGitea |
|
References
- GitHub Security Advisory GHSA-v2w8-m4gr-qj65vendor-advisory
- Gitea 1.27.3 release announcementrelease-notes
- Fix: go-gitea/gitea pull request #39005patch
- Fix: go-gitea/gitea pull request #39018patch
- go-gitea/gitea v1.27.3 releaserelease-notes
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