{"schema":"threatline.record/2","record":{"id":"CVE-2026-66877","aliases":["GHSA-v2w8-m4gr-qj65"],"summary":"Gitea fork workflow approval bypass through concurrency cancellation","details":"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.","categories":["Unclassified"],"product":"Gitea","vendor":"Gitea","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-66877","source_modified_at":"2026-10-15T03:56:53.515Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"Gitea","vendor":"Gitea","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.27.2","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":8.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00426,"percentile":0.35867,"score_date":"2026-10-23"},"published_at":"2026-10-14T14:36:11.356Z","modified_at":"2026-10-15T03:56:53.515Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-66877","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-15T03:56:53.515Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-66877","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-v2w8-m4gr-qj65","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://blog.gitea.com/release-of-1.27.3/","tags":["release-notes"]},{"source":"CVE List","url":"https://github.com/go-gitea/gitea/pull/39005","tags":["patch"]},{"source":"CVE List","url":"https://github.com/go-gitea/gitea/pull/39018","tags":["patch"]},{"source":"CVE List","url":"https://github.com/go-gitea/gitea/releases/tag/v1.27.3","tags":["release-notes"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-14T00:00:00+00:00"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-15T03:56:53.515Z","content_hash":"78b4d8f9187b15d39d986e0b9a89c3417dd10564b6d4d7be1e5394ef6aa81dfd"}}