CVE-2026-123850
Received Received - Intake

CSS Injection in JetBrains YouTrack via Mermaid Diagrams

Publication date: 2026-11-06

Last updated on: 2026-11-06

Assigner: JetBrains s.r.o.

Description
In JetBrains YouTrack before 2026.2.19422 cSS injection was possible in Mermaid diagrams via configuration directives

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Meta Information

Published
2026-11-06
Last Modified
2026-11-06
Generated
2026-11-06
AI Q&A
2026-11-06
EPSS Evaluated
N/A
NVD
CVE-2026-123850
EUVD
EUVD-2026-118353

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
JetBrains YouTrack From 0 (inc) to 2026.2.19422 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-1021 The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain.

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Executive Summary

This vulnerability is a CSS injection issue in JetBrains YouTrack before version 2026.2.19422. It allows attackers to inject malicious CSS code into Mermaid diagrams through configuration directives, potentially altering the appearance or behavior of rendered diagrams.

Impact Analysis

The impact is limited but could allow unauthorized style changes in Mermaid diagrams. This might lead to visual deception, such as misleading users by altering the appearance of diagrams. The attack requires user interaction and has a low impact on confidentiality, integrity, and availability.

Mitigation Strategies

Update JetBrains YouTrack to version 2026.2.19422 or later to address the cSS injection vulnerability in Mermaid diagrams.

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