{"id":"CVE-2026-87719","state":"PUBLISHED","title":"Deserialization of Untrusted Data in GitLab","description":"GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.","publishedAt":"2026-09-12T02:46:26.755Z","updatedAt":"2026-09-23T21:05:05.577Z","severity":{"score":9.9,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","source":"GitLab"},"assigner":"GitLab","products":["GitLab GitLab"],"affected":[{"vendor":"GitLab","product":"GitLab","defaultStatus":"unaffected","versions":[{"version":"18.3","status":"affected","lessThan":"18.11.12","versionType":"semver"},{"version":"19.0","status":"affected","lessThan":"19.0.9","versionType":"semver"},{"version":"19.1","status":"affected","lessThan":"19.1.8","versionType":"semver"},{"version":"19.2","status":"affected","lessThan":"19.2.6","versionType":"semver"},{"version":"19.3","status":"affected","lessThan":"19.3.2","versionType":"semver"}],"cpes":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"],"repo":"git://git@gitlab.com:gitlab-org/gitlab.git"}],"references":["https://gitlab.com/gitlab-org/gitlab/-/work_items/628160","https://hackerone.com/reports/4012289"],"weaknesses":["CWE-502"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/87xxx/CVE-2026-87719.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-87719","state":"PUBLISHED","datePublished":"2026-09-12T02:46:26.755Z","dateUpdated":"2026-09-23T21:05:05.577Z","assignerShortName":"GitLab","assignerOrgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateReserved":"2026-09-09T00:34:03.671Z"},"containers":{"cna":{"title":"Deserialization of Untrusted Data in GitLab","descriptions":[{"lang":"en","value":"GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup."}],"affected":[{"vendor":"GitLab","product":"GitLab","defaultStatus":"unaffected","versions":[{"version":"18.3","status":"affected","lessThan":"18.11.12","versionType":"semver"},{"version":"19.0","status":"affected","lessThan":"19.0.9","versionType":"semver"},{"version":"19.1","status":"affected","lessThan":"19.1.8","versionType":"semver"},{"version":"19.2","status":"affected","lessThan":"19.2.6","versionType":"semver"},{"version":"19.3","status":"affected","lessThan":"19.3.2","versionType":"semver"}],"cpes":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"],"repo":"git://git@gitlab.com:gitlab-org/gitlab.git"}],"references":[{"url":"https://gitlab.com/gitlab-org/gitlab/-/work_items/628160"},{"url":"https://hackerone.com/reports/4012289","name":"HackerOne Bug Bounty Report #4012289","tags":["technical-description","exploit","permissions-required"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.9,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-502","description":"CWE-502: Deserialization of Untrusted Data","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitLab","orgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateUpdated":"2026-09-23T21:05:05.577Z"},"credits":[{"lang":"en","type":"finder","value":"Thanks [kyyblin](https://hackerone.com/kyyblin) for reporting this vulnerability through our HackerOne bug bounty program"}],"solutions":[{"lang":"en","value":"Upgrade to versions 18.11.12, 19.0.9, 19.1.8, 19.2.6, 19.3.2 or above."}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-87719"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T03:55:59.728Z"}}]}}}