XSS in GitLab
CVE-2025-12029
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 class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (42.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- GitLab — versions 15.11, 18.5, 18.6
Weakness classification (CWE)
References
- gitlab.com/gitlab-org/gitlab/-/issues/577975 (issue-tracking, permissions-required, Broken Link)
- hackerone.com/reports/3317485 (Permissions Required, technical-description, permissions-required, exploit)
- about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-2-released/ (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-12029?
- CVE-2025-12029 is a high-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2025-12-11.
- How severe is CVE-2025-12029?
- High severity. CVSS v3 base score is 8.0 out of 10.