CVE-2026-0752

HIGH 8.0

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

CVSS Score

8.0

EPSS Score

0.0%

EPSS Percentile

0th

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that under certain circumstances, could have allowed an unauthenticated user to inject arbitrary scripts into the Mermaid sandbox UI.

CWE	CWE-79
Vendor	gitlab
Product	gitlab
Ecosystems	DevTools
Industries	Technology
Published	Feb 25, 2026
Last Updated	Feb 26, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

GitLab / GitLab

16.2 < 18.7.5 18.8 < 18.8.5 18.9 < 18.9.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/issues/585371 hackerone.com: https://hackerone.com/reports/3473276 about.gitlab.com: https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/

Credits

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