PT-2026-34520 · Gitlab · Gitlab Ce/Ee

Published 2026-04-22 · Updated 2026-04-22 · CVE-2026-5816

Positive Technologies (AI Summary)

CVSS v3.1

8.0

High

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

Name of the Vulnerable Software and Affected Versions GitLab CE/EE versions 18.10 through 18.10.3 GitLab CE/EE versions 18.11 through 18.11.0

Description An issue exists where improper path validation under certain conditions could allow an unauthenticated user to execute arbitrary JavaScript in a user's browser session.

Recommendations Update GitLab CE/EE versions 18.10 through 18.10.3 to version 18.10.4. Update GitLab CE/EE versions 18.11 through 18.11.0 to version 18.11.1.

Exploit

Fix

Weakness Enumeration

CWE-41

Related Identifiers

CVE-2026-5816

Affected Products

Gitlab Ce/Ee

References · 5

• 🔥 https://hackerone.com/reports/3572231 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-5816 · Security Note
• https://gitlab.com/gitlab-org/gitlab/-/work_items/592816 · Note
• https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released · Note
• https://twitter.com/CVEnew/status/2047012126473204183 · Twitter Post