CVE-2026-0752
Received Received - Intake
Cross-Site Scripting in GitLab Mermaid Sandbox UI

Publication date: 2026-02-25

Last updated on: 2026-02-28

Assigner: GitLab Inc.

Description
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.
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Meta Information
Published
2026-02-25
Last Modified
2026-02-28
Generated
2026-06-16
AI Q&A
2026-02-25
EPSS Evaluated
2026-06-14
NVD
CVE-2026-0752
EUVD
EUVD-2026-8720
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
gitlab gitlab From 18.8.0 (inc) to 18.8.5 (exc)
gitlab gitlab From 18.8.0 (inc) to 18.8.5 (exc)
gitlab gitlab 18.9.0
gitlab gitlab 18.9.0
gitlab gitlab From 16.2.0 (inc) to 18.7.5 (exc)
gitlab gitlab From 16.2.0 (inc) to 18.7.5 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability in GitLab CE/EE versions from 16.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 could allow an unauthenticated user to inject arbitrary scripts into the Mermaid sandbox UI under certain circumstances.

Impact Analysis

The vulnerability allows an unauthenticated attacker to inject arbitrary scripts, which can lead to high impact on confidentiality and integrity of the system, potentially compromising sensitive data or altering system behavior.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade GitLab CE/EE to a fixed version. Specifically, update to version 18.7.5 or later if you are on the 18.7 branch, 18.8.5 or later if on the 18.8 branch, or 18.9.1 or later if on the 18.9 branch. These versions contain the remediation for the arbitrary script injection issue in the Mermaid sandbox UI.

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