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.

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)

EPSS: 0.002 (14.7th percentile) — read the EPSS interpretation.

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.

Affected products

Gitlab — versions 15.10, 18.1, 18.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

cve@gitlab.com (issue-tracking, permissions-required, Broken Link)
cve@gitlab.com (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.