Critical Security Issue Affecting TeamCity On-Premises (CVE-2026-63077) – Update to 2025.11.7 or 2026.1.3 Now

Summary Details A critical security vulnerability has been identified in TeamCity On-Premises. If exploited, this flaw may enable an unauthenticated attacker with HTTP(S) access to a TeamCity server to bypass authentication checks and execute arbitrary operating system commands with the privileges of the TeamCity server process. All versions of TeamCity On-Premises are affected.