{"id":"CVE-2025-12653","state":"PUBLISHED","title":"Authentication Bypass by Spoofing in GitLab","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.","publishedAt":"2025-11-26T19:46:12.641Z","updatedAt":"2025-12-10T23:01:24.241Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","source":"GitLab"},"assigner":"GitLab","products":["GitLab GitLab"],"affected":[{"vendor":"GitLab","product":"GitLab","defaultStatus":"unaffected","versions":[{"version":"18.3","status":"affected","lessThan":"18.4.5","versionType":"semver"},{"version":"18.5","status":"affected","lessThan":"18.5.3","versionType":"semver"},{"version":"18.6","status":"affected","lessThan":"18.6.1","versionType":"semver"}],"cpes":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"],"repo":"git://git@gitlab.com:gitlab-org/gitlab.git"}],"references":["https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/","https://gitlab.com/gitlab-org/gitlab/-/issues/579372","https://hackerone.com/reports/3370245"],"weaknesses":["CWE-290"],"ingestedAt":"2026-10-29T20:08:31.050Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/12xxx/CVE-2025-12653.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-12653","state":"PUBLISHED","datePublished":"2025-11-26T19:46:12.641Z","dateUpdated":"2025-12-10T23:01:24.241Z","assignerShortName":"GitLab","assignerOrgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateReserved":"2025-11-03T20:33:36.697Z"},"containers":{"cna":{"title":"Authentication Bypass by Spoofing in GitLab","descriptions":[{"lang":"en","value":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests."}],"affected":[{"vendor":"GitLab","product":"GitLab","defaultStatus":"unaffected","versions":[{"version":"18.3","status":"affected","lessThan":"18.4.5","versionType":"semver"},{"version":"18.5","status":"affected","lessThan":"18.5.3","versionType":"semver"},{"version":"18.6","status":"affected","lessThan":"18.6.1","versionType":"semver"}],"cpes":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"],"repo":"git://git@gitlab.com:gitlab-org/gitlab.git"}],"references":[{"url":"https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/","name":"GitLab Security Release Blog Post","tags":["vendor-advisory"]},{"url":"https://gitlab.com/gitlab-org/gitlab/-/issues/579372","name":"GitLab Issue #579372","tags":["issue-tracking","permissions-required"]},{"url":"https://hackerone.com/reports/3370245","name":"HackerOne Bug Bounty Report #3370245","tags":["technical-description","exploit","permissions-required"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitLab","orgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateUpdated":"2025-12-10T23:01:24.241Z"},"credits":[{"lang":"en","type":"finder","value":"Thanks [pwnie](https://hackerone.com/pwnie) for reporting this vulnerability through our HackerOne bug bounty program"}],"solutions":[{"lang":"en","value":"Upgrade to versions 18.4.5, 18.5.3, 18.6.1 or above."}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-11-28T14:41:33.855824Z","id":"CVE-2025-12653","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-11-28T19:35:10.756Z"}}]}}}