---
id: CVE-2026-84739
title: >-
  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 JavaSc…
summary: >-
  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 JavaSc…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
vendor: GitLab
product: GitLab
affected:
  - GitLab >= 13.11 < 19.2.7
  - GitLab >= 19.3 < 19.3.3
  - GitLab >= 19.4 < 19.4.1
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T15:17:30.183'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84739'
references:
  - url: >-
      https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/
    label: cve@gitlab.com
  - url: 'https://gitlab.com/gitlab-org/gitlab/-/work_items/627316'
    label: cve@gitlab.com
  - url: 'https://hackerone.com/reports/3938482'
    label: cve@gitlab.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-29T15:04:27.633751Z'
epss: 0.00362
epssPercentile: 0.2755
ingestedAt: '2026-09-29T10:31:36.314Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.