CVE-2025-12029

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

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.11 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have, under certain circumstances, allowed an unauthenticated user to perform unauthorized actions on behalf of another user by injecting malicious external scripts into the Swagger UI."

Affected

GitLab

CVSS v3.1 GITLAB

8.0 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

EPSS

0.53% chance of exploitation in the next 30 days, 43rd percentile

Published

2025-12-11

Updated

2026-02-26

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3317485

Security advisories

• https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released

References

• CVE Record
• NVD entry