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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-02-25

Last Modified

2026-02-28

Generated

2026-07-06

AI Q&A

2026-02-25

EPSS Evaluated

2026-07-05

NVD

CVE-2026-0752

EUVD

EUVD-2026-8720

Affected Vendors & Products

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

KEV

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.

Attack-Flow Graph

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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