Code Injection in TeamCity - CVE-2026-65906
Published: August 17, 2026
Vulnerability identifier: #VU143857
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-65906
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to code injection in the Kotlin DSL sandbox when processing Kotlin DSL content. A remote user can craft malicious Kotlin DSL input to execute arbitrary code.
Affected software
TeamCity
How to mitigate CVE-2026-65906
Install security update from vendor's website.
TeamCity - addressed in versions 2025.11.6, 2026.1.2