CVE-2026-100254 Command injection in TeamCity

What is CVE-2026-100254?

CVE-2026-100254 is a high-severity command injection vulnerability in Jetbrains Teamcity, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 authenticated users could execute commands on Windows servers via CRLF injection in Pipeline Git connection settings

Weakness: CWE-78

Which versions are affected by CVE-2026-100254?

It affects 1 product.

Products include Jetbrains Teamcity.

How do I fix CVE-2026-100254?

No fix has been published for CVE-2026-100254 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-100254 being exploited?

There is no known exploitation of CVE-2026-100254 in the wild and no public exploit code.

Other vulnerabilities in Jetbrains Teamcity

• CVE-2026-63077 JetBrains TeamCity Deserialization of Untrusted Data Exploited Critical 9.8
• CVE-2024-27198 JetBrains TeamCity Authentication Bypass Exploited Critical 9.8
• CVE-2023-42793 JetBrains TeamCity Authentication Bypass Exploited Critical 9.8
• CVE-2024-27199 JetBrains TeamCity Relative Path Traversal Exploited High 7.3
• CVE-2024-23917 Auth bypass in TeamCity Critical 9.8

All Jetbrains Teamcity vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-6h2c-wm78-7wv3.