GitLab 18 CE/EE XSS/Exec Remote Code in User Session via Sanitization Flaw
CVE-2026-6335 Published on May 14, 2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.
Vulnerability Analysis
CVE-2026-6335 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-6335 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-6335
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Affected Versions
GitLab:- Version 18.11 and below 18.11.3 is affected.