Stored cross-site scripting in Gitlab Community Edition and GitLab Enterprise Edition - CVE-2026-2973
Published: March 25, 2026 / Updated: March 26, 2026
Vulnerability identifier: #VU124606
CSH Severity: Medium
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:Green
CVE-ID: CVE-2026-2973
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
Gitlab Community Edition
GitLab Enterprise Edition
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary JavaScript in a user's browser.
The vulnerability exists due to improper sanitization of entity-encoded content in the Mermaid diagram renderer when rendering content. A remote user can inject malicious Mermaid diagrams containing encoded scripts, which when viewed by another user, execute arbitrary JavaScript in their browser.
How to mitigate CVE-2026-2973
Install security update from vendor's website.