CVE-2026-100253 Code injection in TeamCity

What is CVE-2026-100253?

CVE-2026-100253 is a high-severity code 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 sandbox escape leading to code execution was possible via the versioned settings Kotlin DSL

Weakness: CWE-184

Which versions are affected by CVE-2026-100253?

It affects 1 product.

Products include Jetbrains Teamcity.

How do I fix CVE-2026-100253?

No fix has been published for CVE-2026-100253 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-100253 being exploited?

There is no known exploitation of CVE-2026-100253 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-6hq9-538r-6p54.