CVE-2026-2973

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

State: Published
Severity: 5.4 Medium
Published: Mar 25, 2026
Updated: Mar 26, 2026
Reserved: Feb 22, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	GitLab

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
GitLabGitLab	17.7 to before 18.8.7Affected 18.9 to before 18.9.3Affected 18.10 to before 18.10.1Affected

References

HackerOne Bug Bounty Report #3566802technical-descriptionexploitpermissions-required
https://gitlab.com/gitlab-org/gitlab/-/work_items/591049
https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/

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