CVE-2026-5816: GitLab

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.10 before 18.10.4 and 18.11 before 18.11.1 that could have allowed an unauthenticated user to execute arbitrary JavaScript in a user's browser session due to improper path validation under certain conditions.

Affected products

• GitLab GitLab: from 18.10.0, before 18.10.4 (fixed in 18.10.4); version 18.11.0 only

Published 2026-04-22. Last modified 2026-06-17.