CVE-2026-100277

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

• Published Sep 30, 2026
• CVSS 9.8 critical
• 0.3% chance of exploitation in the next 30 days (EPSS)
• A fix is available

CVE-2026-100277 at the National Vulnerability Database