CVE-2026-84739

Published: Sep 29, 2026Modified: Oct 5, 2026

8.7

Vector

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

Exploitability: 2.3 / Impact: 5.8

Source: cve@gitlab.com (Secondary)

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.

Affected (6)

Products: Gitlab: Gitlab

Gitlab

1 product

Gitlab

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Gitlab Gitlab	13.11.0 ≤ version < 19.2.7
Gitlab Gitlab	19.3.0 ≤ version < 19.3.3
Gitlab Gitlab	13.11.0 ≤ version < 19.2.7
Gitlab Gitlab	19.3.0 ≤ version < 19.3.3
Gitlab Gitlab	Version 19.4.0
Gitlab Gitlab	Version 19.4.0

Related CWEs

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (3)

https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/

Source: cve@gitlab.com

Release NotesVendor Advisory

https://gitlab.com/gitlab-org/gitlab/-/work_items/627316

Source: cve@gitlab.com

Broken Link

https://hackerone.com/reports/3938482

Source: cve@gitlab.com

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Timeline

No history available yet.