CVE-2026-100277: JetBrains Youtrack

Critical severity, CVSS 9.8. EPSS: 0.3% chance of exploitation in the next 30 days.

In JetBrains YouTrack before 2026.2.19197 account takeover was possible by replaying a notification signature

Affected products

• JetBrains Youtrack: before 2026.2.19197 (fixed in 2026.2.19197)

Published 2026-09-30. Last modified 2026-10-02.