CVE-2026-2973

MEDIUM severity · CVSS 5.4 · Cross-site scripting (XSS)

5.4CVSS MEDIUM

Summary

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.7 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to execute arbitrary JavaScript in a user's browser due to improper sanitization of entity-encoded content in Mermaid diagrams.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionRequired

Confidentiality impactLow

Integrity impactLow

Availability impactNone

Exploit probability (EPSS)0%

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

Affected products we track (1)

GitLab

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Additional information

NVD record
https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/591049
https://hackerone.com/reports/3566802