---
id: CVE-2026-123850
title: >-
  In JetBrains YouTrack before 2026.2.19422 cSS injection was possible in
  Mermaid diagrams via configuration directives
summary: >-
  In JetBrains YouTrack before 2026.2.19422 cSS injection was possible in
  Mermaid diagrams via configuration directives
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-1021
vendor: JetBrains
product: YouTrack
affected:
  - YouTrack < 2026.2.19422
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:40:42.373709Z'
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:47:16.888Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123850'
references:
  - url: 'https://www.jetbrains.com/privacy-security/issues-fixed/'
tags:
  - cve.org
ingestedAt: '2026-11-06T16:57:43.125Z'
epss: 0.00208
epssPercentile: 0.10966
---

## Overview

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

## Affected

- `YouTrack < 2026.2.19422`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.