CVE-2026-123850

CSS Injection via Mermaid Diagram Configuration in JetBrains YouTrack

Published Nov 6, 2026 CVSS 3.1 · 3.5 Low EPSS < 1% KEV · Not listed
Description
In JetBrains YouTrack before 2026.2.19422 cSS injection was possible in Mermaid diagrams via configuration directives

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Jetbrains
Jetbrains youtrack
Vendors & Products Jetbrains
Jetbrains youtrack
Type Values Removed Values Added
Title CSS Injection via Mermaid Diagram Configuration in JetBrains YouTrack
Type Values Removed Values Added
Description In JetBrains YouTrack before 2026.2.19422 cSS injection was possible in Mermaid diagrams via configuration directives
Weaknesses CWE-1021
References
Metrics cvssV3_1

{'score': 3.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
JetBrains
Published
Updated
Nov 6, 2026, 4:47 PM
Reserved
Nov 6, 2026, 4:05 PM
Status
Awaiting Analysis
Published
Nov 6, 2026, 5:17 PM
Modified
Nov 6, 2026, 8:20 PM