GitLab CE/EE Authenticated XSS 17.1-18.6.2 Unauthorized Actions
CVE-2025-8405 Published on December 11, 2025
GitLab has remediated a security issue in GitLab CE/EE affecting all versions from 17.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to perform unauthorized actions on behalf of other users by injecting malicious HTML into vulnerability code flow displays.
Vulnerability Analysis
CVE-2025-8405 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is an Output Sanitization Vulnerability?
The software prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
CVE-2025-8405 has been classified to as an Output Sanitization vulnerability or weakness.
Products Associated with CVE-2025-8405
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Affected Versions
GitLab:- Version 17.1 and below 18.4.6 is affected.
- Version 18.5 and below 18.5.4 is affected.
- Version 18.6 and below 18.6.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.