Unrated severityNVD Advisory· Published Dec 11, 2025· Updated Dec 16, 2025
Improper Encoding or Escaping of Output in GitLab
CVE-2025-12734
Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.6 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to, under certain conditions, render content in dialogs to other users by injecting malicious HTML content into merge request titles.
Affected products
2cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*range: 15.6
- (no CPE)range: >=15.6 <18.4.6, >=18.5 <18.5.4, >=18.6 <18.6.2
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- hackerone.com/reports/3379381mitretechnical-descriptionexploitpermissions-required
- gitlab.com/gitlab-org/gitlab/-/issues/579573mitreissue-trackingpermissions-required
- about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/mitre
News mentions
1- GitLab Patch Release: 18.6.2, 18.5.4, 18.4.6GitLab Security Releases · Dec 10, 2025