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.

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Fixes

Solution

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Workaround

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History

Wed, 14 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 14 Oct 2026 14:45:00 +0000

Type Values Removed Values Added
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.
Title Gitea fork workflow approval bypass through concurrency cancellation
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Gitea

Published:

Updated: 2026-10-14T15:12:01.772Z

Reserved: 2026-08-13T16:50:58.698Z

Link: CVE-2026-66877

cve-icon Vulnrichment

Updated: 2026-10-14T15:04:12.896Z

cve-icon NVD

Status : Deferred

Published: 2026-10-14T15:17:21.863

Modified: 2026-10-14T16:17:50.553

Link: CVE-2026-66877

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses