CVE-2026-84739: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
High · CVSS 8.7 (CVSS 3.1)EPSS 0.34%, 28th percentilePublished Updated Assigner: GitLab
Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScript in the context of another user's browser session due to improper sanitization of path components in the merge request diff viewer.
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N · CWE-79
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
GitLab: GitLab
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/ (opens in new tab)
- gitlab.com/gitlab-org/gitlab/-/work_items/627316 (opens in new tab)
- hackerone.com/reports/3938482 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)