CVE-2026-84739

HIGHCVSS 8.7

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.

Timeline

Published:September 29th, 2026 10:17 AM

Last modified:October 5th, 2026 5:06 PM

CVSS Scoring

CVSS v3: 8.7 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected Software

From NVD CPE configuration data

Vendors

gitlab

Products

gitlab

Weaknesses (CWE)

CWE-79

References & Reports

Advisories, patches, and third-party reports

https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/Release Notes
https://gitlab.com/gitlab-org/gitlab/-/work_items/627316Broken Link
https://hackerone.com/reports/3938482Permissions Required

Source: NIST NVD · Data may lag official sources by up to one minute