Cross-site scripting in Gitlab Community Edition and GitLab Enterprise Edition - CVE-2026-6335

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Main Vulnerability Database Vulnerabilities #VU131678

Cross-site scripting in Gitlab Community Edition and GitLab Enterprise Edition - CVE-2026-6335

Published: May 18, 2026


Vulnerability identifier: #VU131678
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-6335
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: GitLab, Inc
Affected software:
Gitlab Community Edition
GitLab Enterprise Edition

Detailed vulnerability description

The vulnerability allows a remote user to execute arbitrary code in another user's browser session.

The vulnerability exists due to improper sanitization in Banzai markdown sanitizer when rendering crafted markdown content. A remote user can inject crafted script content to execute arbitrary code in another user's browser session.

User interaction is required to view the crafted content.


How to mitigate CVE-2026-6335

Install security update from vendor's website.

Sources