CVE-2026-100255: JetBrains TeamCity

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 administrator account takeover was possible via password reset

Affected products

• JetBrains TeamCity: before 2025.11.8 (fixed in 2025.11.8); from 2026.1, before 2026.1.4 (fixed in 2026.1.4)

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