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CVE-2025-4278: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in GitLab

8.7 CVSS

Description

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.

Classification

CVE ID: CVE-2025-4278

CVSS Base Severity: HIGH

CVSS Base Score: 8.7

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Problem Types

CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Affected Products

Vendor: GitLab

Product: GitLab

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 2.77% (scored less or equal to compared to others)

EPSS Date: 2025-06-21 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-4278
https://gitlab.com/gitlab-org/gitlab/-/issues/539198
https://hackerone.com/reports/3085738

Timeline