CVE-2026-66877 Details
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.
A vulnerability in Gitea's handling of workflow approvals for fork contributors allows unreviewed code to be executed on self-hosted runners. This issue arises because the approval requirement is not consistently enforced across all job dispatch paths. When a job in a concurrency group is canceled, it can trigger blocked jobs to be re-emitted and dispatched without approval. This vulnerability affects Gitea versions through 1.27.2 and can be exploited by anyone who can open a pull request.
Upgrade Gitea to version 1.27.3, which addresses this vulnerability by ensuring that the approval requirement is consistently enforced across all job dispatch paths.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 14, 2026CISA-ADP
Assessed Oct 14, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://blog.gitea.com/release-of-1.27.3/ | Gitea Limited | Release NotesVendor |
| https://github.com/go-gitea/gitea/pull/39005 | Gitea Limited | Issue TrackingVendor |
| https://github.com/go-gitea/gitea/pull/39018 | Gitea Limited | Issue TrackingVendor |
| https://github.com/go-gitea/gitea/releases/tag/v1.27.3 | Gitea Limited | Release NotesVendor |
| https://github.com/go-gitea/gitea/security/advisories/GHSA-v2w8-m4gr-qj65 | Gitea Limited | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-284 | Improper Access Control | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| Gitea | <= 1.27.2 (semver) |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 15, 2026 | CVE Modified | CISA-ADP |
| Oct 14, 2026 | CVE Modified | CISA-ADP |
| Oct 14, 2026 | New CVE Received | Gitea Limited |