# CVE-2026-100278: JetBrains YouTrack privilege escalation in comment management

Source: https://junglewise.ai/threats/cve-2026-100278-in-jetbrains-youtrack-before-2026-2-19197-users-with-restricted  
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-2026-100278 · Severity: medium · CVSS 4.9 · Published 2026-09-30

YouTrack is a project management and issue tracking system used by development teams. A flaw allowed users with limited permissions to edit and hide comments posted by other users, undermining the integrity of project records and audit trails. This could enable users to conceal their actions or those of colleagues by tampering with documented discussions.

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

## Quick answers

**Is CVE-2026-100278 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100278 being exploited in the wild.

**How severe is CVE-2026-100278?** Medium severity, with a CVSS score of 4.9, published 30 September 2026.

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

**Is there a fix for CVE-2026-100278?** 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-2026-100278 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-100278?** 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

Users with restricted permissions could bypass access controls to modify and hide comments authored by other users in YouTrack. The vulnerability is a privilege escalation issue in the comment management system that does not require special exploitation techniques. A fix is available in YouTrack version 2026.2.19197 and later.

## 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

- [JetBrains YouTrack missing authorization in VCS hosting configuration](https://junglewise.ai/threats/cve-2026-123332-in-jetbrains-youtrack-before-2026-2-19562-missing-authorization)
- [JetBrains YouTrack article visibility restriction bypass](https://junglewise.ai/threats/cve-2026-123331-in-jetbrains-youtrack-before-2026-2-19197-article-editors-could)
- [JetBrains YouTrack missing authorization in issue visibility settings](https://junglewise.ai/threats/cve-2026-123330-in-jetbrains-youtrack-before-2026-2-19562-missing-authorization)
- [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)