High 8.1Published Oct 14, 2026

CVE-2026-66877Gitea fork workflow approval bypass through concurrency cancellation

Updated under an hour ago (Oct 26, 2026, 5:23 PM ET)

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It affects Gitea. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.43%, higher than 36% of scored CVEs.

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Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.43% (percentile 36)
Assigned by: Gitea
NVD analysis: Deferred
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Gitea Gitea gitea:gitea (from the name)	through 1.27.2	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.