{"id":"CVE-2026-78252","state":"PUBLISHED","title":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that, under certain conditions, an authenticated user could have induced a targeted user to perform unintended state-changing HTTP requests due to improper sanitization of user-controlled data in the Markdown JSON table renderer.","publishedAt":"2026-09-16T06:33:30.825Z","updatedAt":"2026-09-16T15:41:47.657Z","severity":{"score":8.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L","source":"GitLab"},"assigner":"GitLab","products":["GitLab GitLab"],"affected":[{"vendor":"GitLab","product":"GitLab","defaultStatus":"unaffected","versions":[{"version":"15.3","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"}],"repo":"git://git@gitlab.com:gitlab-org/gitlab.git","cpes":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"]}],"references":["https://gitlab.com/gitlab-org/gitlab/-/work_items/621447","https://hackerone.com/reports/3917471","https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-2-released/"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/78xxx/CVE-2026-78252.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-78252","state":"PUBLISHED","datePublished":"2026-09-16T06:33:30.825Z","dateUpdated":"2026-09-16T15:41:47.657Z","assignerShortName":"GitLab","assignerOrgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateReserved":"2026-08-24T07:09:13.142Z"},"containers":{"cna":{"title":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab","descriptions":[{"lang":"en","value":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that, under certain conditions, an authenticated user could have induced a targeted user to perform unintended state-changing HTTP requests due to improper sanitization of user-controlled data in the Markdown JSON table renderer."}],"affected":[{"vendor":"GitLab","product":"GitLab","defaultStatus":"unaffected","versions":[{"version":"15.3","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"}],"repo":"git://git@gitlab.com:gitlab-org/gitlab.git","cpes":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"]}],"references":[{"url":"https://gitlab.com/gitlab-org/gitlab/-/work_items/621447"},{"url":"https://hackerone.com/reports/3917471","name":"HackerOne Bug Bounty Report #3917471","tags":["technical-description","exploit","permissions-required"]},{"url":"https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-2-released/"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW","baseScore":8.2,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitLab","orgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateUpdated":"2026-09-16T06:33:30.825Z"},"solutions":[{"lang":"en","value":"Upgrade to versions 19.1.8, 19.2.6, 19.3.2 or above."}],"credits":[{"lang":"en","value":"Thanks [a_m_a_m](https://hackerone.com/a_m_a_m) for reporting this vulnerability through our HackerOne bug bounty program","type":"finder"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-16T15:39:58.423500Z","id":"CVE-2026-78252","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-16T15:41:47.657Z"}}]}}}