Vulnerability details
CVE-2026-66877
Gitea Gitea
Gitea fork workflow approval bypass through concurrency cancellation
CVSS 3.1
8.1High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.1High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Gitea | Gitea | v ≤ 1.27.2 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://github.com/go-gitea/gitea/security/advisories/GHSA-v2w8-m4gr-qj65 vendor-advisory
- https://blog.gitea.com/release-of-1.27.3/ release-notes
- https://github.com/go-gitea/gitea/pull/39005 patch
- https://github.com/go-gitea/gitea/pull/39018 patch
- https://github.com/go-gitea/gitea/releases/tag/v1.27.3 release-notes
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Details
- Published
- 2026-10-14
- Last updated
- 2026-10-15
- State
- Published
- Assigner (CNA)
- Gitea
Exploit prediction (EPSS)
0.42%
Probability of exploitation in 30 days
37%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-284Improper Access Control