GitLab < 18.4.6 / 18.5.4 / 18.6.2 - Swagger UI External Script Injection
CVE-2025-12029 Published on December 11, 2025
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."
Vulnerability Analysis
CVE-2025-12029 can be exploited with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2025-12029 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2025-12029
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Affected Versions
GitLab:- Version 15.11 and below 18.4.6 is affected.
- Version 18.5 and below 18.5.4 is affected.
- Version 18.6 and below 18.6.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.