XSS in GitLab
CVE-2025-4278
An issue has been discovered in GitLab CE/EE affecting all versions starting with 18.0 before 18.0.2. Under certain conditions html injection in new search page could lead to account takeover.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.106 (95.7th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.090 · newest: 0.106 · change: +0.017
Affected products
- GitLab — versions 18.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gitlab.com/gitlab-org/gitlab/-/issues/539198 (issue-tracking, permissions-required, Broken Link)
- hackerone.com/reports/3085738 (Permissions Required, technical-description, permissions-required, exploit)
Frequently asked questions
- What is CVE-2025-4278?
- CVE-2025-4278 is a high-severity vulnerability in GitLab, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 8.7/10. Published 2025-06-12.
- How severe is CVE-2025-4278?
- High severity. CVSS v3 base score is 8.7 out of 10.
- Is CVE-2025-4278 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.