🔐 CVE Alert

CVE-2026-2973

MEDIUM 5.4

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

CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
4th

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.

CWE CWE-79
Vendor gitlab
Product gitlab
Ecosystems
Industries
Technology
Published Mar 25, 2026
Last Updated Mar 26, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Affected Versions

GitLab / GitLab
17.7 < 18.8.7 18.9 < 18.9.3 18.10 < 18.10.1

References

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

Credits

Thanks [go7f0](https://hackerone.com/go7f0) for reporting this vulnerability through our HackerOne bug bounty program