XSS in GitLab
CVE-2025-4439
An issue has been discovered in GitLab CE/EE affecting all versions from 15.10 before 18.0.5, 18.1 before 18.1.3, and 18.2 before 18.2.1 that could have allowed an authenticated user to perform cross-site scripting attacks when the instance is served through certain content delivery networks.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (14.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- GitLab — versions 15.10, 18.1, 18.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gitlab.com/gitlab-org/gitlab/-/issues/541177 (issue-tracking, permissions-required, Broken Link)
- hackerone.com/reports/3120111 (Permissions Required, technical-description, permissions-required, exploit)
Frequently asked questions
- What is CVE-2025-4439?
- CVE-2025-4439 is a high-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 7.7/10. Published 2025-07-23.
- How severe is CVE-2025-4439?
- High severity. CVSS v3 base score is 7.7 out of 10.
- Is CVE-2025-4439 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.