# CVE-2026-100275: JetBrains YouTrack stored XSS in workflow error notification

Source: https://junglewise.ai/threats/cve-2026-100275-in-jetbrains-youtrack-before-2026-2-19197-stored-xss-in-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-100275 · Severity: medium · CVSS 6.9 · Published 2026-09-30

JetBrains YouTrack is a project and issue tracking platform used by development teams. A stored cross-site scripting (XSS) vulnerability in the workflow error notification toast allows attackers to inject malicious scripts that execute in users' browsers, potentially leading to account compromise or data theft when users view error messages.

Technologies: [Jetbrains YouTrack](https://junglewise.ai/threats/technologies/youtrack). Vendors: [Jetbrains](https://junglewise.ai/threats/vendors/jetbrains).

## Quick answers

**Is CVE-2026-100275 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100275 being exploited in the wild.

**How severe is CVE-2026-100275?** Medium severity, with a CVSS score of 6.9, published 30 September 2026.

**Which products and versions are affected?** Jetbrains YouTrack before 2026.2.19197.

**Is there a fix for CVE-2026-100275?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-100275 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-100275?** Check whether you run Jetbrains YouTrack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a stored XSS flaw in the workflow error notification toast component of YouTrack. Attackers can inject JavaScript that persists in the application's database and executes when users view the affected notification, requiring no special privileges or user interaction beyond normal application use. The issue affects versions prior to 2026.2.19197 and is fixed in that release.

## Affected products

- JetBrains YouTrack before 2026.2.19197

## Timeline

- 2026-09-30: disclosed

## References

- [https://www.jetbrains.com/privacy-security/issues-fixed/](https://www.jetbrains.com/privacy-security/issues-fixed/)

## Related threats

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- [JetBrains YouTrack missing authorization in TeamCity integration](https://junglewise.ai/threats/cve-2026-123329-in-jetbrains-youtrack-before-2026-2-19562-missing-authorization)
- [JetBrains YouTrack app permission bypass privilege escalation](https://junglewise.ai/threats/cve-2026-123328-in-jetbrains-youtrack-before-2026-2-19656-app-permission-bypass)