JetBrains fixes a critical vulnerability

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[TLP:CLEAR] JetBrains fixes a critical vulnerability

In TeamCity On-Premises, JetBrains fixes a critical vulnerability with versions 2026.1.3, 2025.11.7 or a security patch plugin [1] that addresses it [2].

JetBrains TeamCity - OS command execution (CVE-2026-63077)

CVSS 9.8 (Critical)

An unauthenticated remote attacker can use the agent polling protocol to execute arbitrary operating-system-level commands with the privileges of the TeamCity server process, and thereby potentially read sensitive data, modify the server state or tamper with the outputs of builds and downstream CI/CD pipelines [2].

The vulnerability is present in product:

TeamCity; <2025.11.7; >=2026.1., <2026.1.3;

CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

More information:

CVE-2026-63077 at cve.org, NVD
CWE-502: Deserialization of Untrusted Data at cwe.mitre.org

The vulnerability was publicly disclosed 27. 7. 2026.

Links

By CESNET, z.s.p.o. Jakub Maloštík on 28. 7. 2026.

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[TLP:CLEAR] JetBrains fixes a critical vulnerability

JetBrains TeamCity - OS command execution (CVE-2026-63077)

CVSS 9.8 (Critical)

Links