CVE-2025-4439: GitLab

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue has been discovered in GitLab CE/EE affecting all versions from 15.10 before 18.0.5, 18.1 before 18.1.3, and 18.2 before 18.2.1 that could have allowed an authenticated user to perform cross-site scripting attacks when the instance is served through certain content delivery networks.

Affected products

• GitLab GitLab: from 15.10.0, before 18.0.5 (fixed in 18.0.5); from 18.1.0, before 18.1.3 (fixed in 18.1.3); version 18.2 only

Published 2025-07-23. Last modified 2026-06-17.