{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66877", "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2", "state": "PUBLISHED", "assignerShortName": "Gitea", "dateReserved": "2026-08-13T16:50:58.698Z", "datePublished": "2026-10-14T14:36:11.356Z", "dateUpdated": "2026-10-14T15:12:01.772Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2", "shortName": "Gitea", "dateUpdated": "2026-10-14T14:36:11.356Z"}, "title": "Gitea fork workflow approval bypass through concurrency cancellation", "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"vendor": "Gitea", "product": "Gitea", "packageName": "code.gitea.io/gitea", "defaultStatus": "unaffected", "versions": [{"version": "0", "status": "affected", "lessThanOrEqual": "1.27.2", "versionType": "semver"}]}], "references": [{"url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-v2w8-m4gr-qj65", "name": "GitHub Security Advisory GHSA-v2w8-m4gr-qj65", "tags": ["vendor-advisory"]}, {"url": "https://blog.gitea.com/release-of-1.27.3/", "name": "Gitea 1.27.3 release announcement", "tags": ["release-notes"]}, {"url": "https://github.com/go-gitea/gitea/pull/39005", "name": "Fix: go-gitea/gitea pull request #39005", "tags": ["patch"]}, {"url": "https://github.com/go-gitea/gitea/pull/39018", "name": "Fix: go-gitea/gitea pull request #39018", "tags": ["patch"]}, {"url": "https://github.com/go-gitea/gitea/releases/tag/v1.27.3", "name": "go-gitea/gitea v1.27.3 release", "tags": ["release-notes"]}], "credits": [{"lang": "en", "value": "https://github.com/klydz", "type": "reporter"}, {"lang": "en", "value": "https://github.com/bircni", "type": "remediation developer"}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-284", "lang": "en", "description": "CWE-284 Improper Access Control"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-10-14T15:08:00.453316Z", "id": "CVE-2026-66877", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-14T15:12:01.772Z"}}]}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageName": "code.gitea.io/gitea", "product": "Gitea", "vendor": "Gitea", "versions": [{"lessThanOrEqual": "1.27.2", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "88ee5874-cf24-4952-aea0-31affedb7ff2"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-66877", "lastModified": "2026-10-14T15:17:21.863", "metrics": {}, "published": "2026-10-14T15:17:21.863", "references": [{"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "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"}], "sourceIdentifier": "88ee5874-cf24-4952-aea0-31affedb7ff2", "vulnStatus": "Received"}

{}

{}