Vulnerability · Published Dec 11, 2025 · Assigned by GitLab
CVE-2025-12029Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
High 8.0
In plain English
A high-severity cross-site scripting in GitLab from GitLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Severity (CVSS 3.1)8.0High
Exploit odds (30 days)0.5%top 55.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
References
- GitLab Issue #577975 issue-tracking, permissions-required
- HackerOne Bug Bounty Report #3317485 technical-description, exploit, permissions-required
- https://about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/