CISA Flags TeamCity CVE-2026-63077 RCE Flaw Under Active Exploitation in the Wild

A newly patched security flaw impacting on-premise versions of JetBrains TeamCity has come under active exploitation in the wild, according to the U.S. Cybersecurity and Infrastructure Security Agency CISA. The vulnerability in question is CVE-2026-63077 CVSS score: 9.8, a case of deserialization...

JetBrains TeamCity < 2025.11.7 / 2026.1.x < 2026.1.3 RCE (CVE-2026-63077)

The version of JetBrains TeamCity installed on the remote host is prior to 2025.11.7 or 2026.1.x prior to 2026.1.3. It is, therefore, affected by a vulnerability: - Unauthenticated remote code execution was possible via the agent polling protocol. CVE-2026-63077 Note that Nessus has not tested fo...

Critical TeamCity Flaw Could Let Attackers Run OS Commands Without Logging In

JetBrains is urging customers of on-premise versions of TeamCity to update to the latest version following the discovery of a critical security issue that could result in arbitrary code execution. The vulnerability, assigned CVE-2026-63077 CVSS score: 9.8, affects all TeamCity On-Premises version...

CVE-2026-63077

In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent polling protocol...

CVE-2026-63077

CVE-2026-63077 affects JetBrains TeamCity On-Premises: unauthenticated remote code execution via deserialization of untrusted data in the agent polling protocol. Affected are TeamCity versions prior to 2025.11.7 and prior to 2026.1.3. The root cause is deserialization of untrusted data that allow...