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