XSS in GitLab
CVE-2025-9642
An issue has been discovered in GitLab CE/EE affecting all versions from 14.10 before 18.2.7, 18.3 before 18.3.3, and 18.4 before 18.4.1 that could allow an attacker to inject malicious content that may lead to account takeover.
Vulnerability class: XSS (Cross-Site Scripting)
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: 0.005 (43.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.7% 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 18.4.0, 18.3, 18.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gitlab.com/gitlab-org/gitlab/-/issues/566505 (issue-tracking, permissions-required, Broken Link)
- hackerone.com/reports/3297413 (Permissions Required, technical-description, permissions-required, exploit)
Frequently asked questions
- What is CVE-2025-9642?
- CVE-2025-9642 is a high-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2025-09-26.
- How severe is CVE-2025-9642?
- High severity. CVSS v3 base score is 8.7 out of 10.
- Is CVE-2025-9642 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.