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

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vulnerabilities

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

JetBrains disclosed a critical vulnerability in TeamCity on-premises (CVE-2026-63077, CVSS 9.8) that permits unauthenticated arbitrary code execution. The flaw has been patched in versions 2025.11.7 and 2026.1.3, while TeamCity Cloud instances are unaffected.

Why it matters: Organizations running on-premises TeamCity installations face immediate risk of complete system compromise without authentication; patching to the specified versions is required today.

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Correction

Correction recorded as of .

vulnerabilities

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

JetBrains disclosed a critical vulnerability in TeamCity on-premises (CVE-2026-63077, CVSS 9.8) that permits unauthenticated arbitrary code execution. The flaw has been patched in versions 2025.11.7 and 2026.1.3, while TeamCity Cloud instances are unaffected.

Why it matters: Organizations running on-premises TeamCity installations face immediate risk of complete system compromise without authentication; patching to the specified versions is required today.

Source published
First seen by Cybersecurity Tracker

Source attribution

Glossary