Arbitrary Script Injection Vulnerability in GitLab CE/EE
CVE-2026-0752

8HIGH

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
25 February 2026

What is CVE-2026-0752?

A vulnerability exists in GitLab CE/EE that permits an unauthenticated user to inject arbitrary scripts into the Mermaid sandbox user interface. This issue affects multiple versions of GitLab, including those prior to 18.7.5, 18.8.5, and 18.9.1. The vulnerability arises under specific conditions, which, if exploited, could compromise the integrity of the Mermaid sandbox, potentially allowing attackers to execute unwanted operations or manipulate user sessions.

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Affected Version(s)

GitLab 16.2 < 18.7.5

GitLab 18.8 < 18.8.5

GitLab 18.9 < 18.9.1

References

https://gitlab.com/gitlab-org/gitlab/-/issues/585371
issue-trackingpermissions-required
https://hackerone.com/reports/3473276
technical-descriptionexploitpermissions-required
https://about.gitlab.com/releases/2026/02/25/patch-releas...

CVSS V3.1

Score:
8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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