{"id":"CVE-2026-66877","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-66877","generatedAt":"2026-10-28T03:58:16.148Z","title":"This allows unreviewed workflow code to execute on self-hosted runners; fork secrets remain withheld and the run token remains read-only.","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.","published":"2026-10-14T15:17:22.000Z","lastModified":"2026-10-15T04:18:25.000Z","status":"Deferred","sourceIdentifier":"88ee5874-cf24-4952-aea0-31affedb7ff2","cvss":{"version":"3.1","score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-284"],"affected":[],"epss":{"score":0.00426,"percentile":0.36718,"date":"2026-10-27","history":[{"date":"2026-10-15","score":0.00426,"percentile":0.35377}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-10-14T17:45:19.000Z","detail":{"from":null,"score":"8.1","severity":"HIGH","fromSeverity":null},"summary":"Now scored CVSS 8.1 HIGH."},{"kind":"new","label":"New CVE","at":"2026-10-14T15:17:22.000Z","detail":{"score":null,"severity":null,"publishedAt":"2026-10-14T15:17:21.863Z"},"summary":"New CVE, high severity (CVSS 8.1)."}],"references":[{"url":"https://blog.gitea.com/release-of-1.27.3/","source":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/pull/39005","source":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/pull/39018","source":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/releases/tag/v1.27.3","source":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-v2w8-m4gr-qj65","source":"88ee5874-cf24-4952-aea0-31affedb7ff2"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-66877","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}