CVE-2026-2973

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 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.

Affected

GitLab

CVSS v3.1 GITLAB

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

EPSS

0.29% chance of exploitation in the next 30 days, 21st percentile

Published

2026-03-25

Updated

2026-03-26

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3566802

Security advisories

• https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released

References

• CVE Record
• NVD entry