High-Severity Security Issue Affecting TeamCity On-Premises (CVE-2026-44413) – Update to 2026.1 Now

Summary Details A high-severity post-authentication security vulnerability has been identified in TeamCity On-Premises. If exploited, this flaw may allow any authenticated user to expose some parts of the TeamCity server API to unauthorized users. All versions of TeamCity On-Premises are affected, while TeamCity Cloud is not affected and requires no action.