CVE-2026-84739CWE-79cross-site-scripting

CVE-2026-84739

High · published September 29, 2026

CVSS v3.1
8.7
EPSS
0%
Percentile
39.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00467 · 39.5th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-29T14:17Z
Affected products (6)
ProductVersionsFixed in
gitlab/gitlab≥ 13.11.0, < 19.2.719.2.7
gitlab/gitlab≥ 13.11.0, < 19.2.719.2.7
gitlab/gitlab≥ 19.3.0, < 19.3.319.3.3
gitlab/gitlab≥ 19.3.0, < 19.3.319.3.3
gitlab/gitlaball versions—
gitlab/gitlaball versions—
References (3)
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/ · [email protected]https://gitlab.com/gitlab-org/gitlab/-/work_items/627316 · [email protected]https://hackerone.com/reports/3938482 · [email protected]
EPSS history
Timeline
  • 30 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 29 SEP 09:34Z
    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
    cvelistv5