CVE-2026-49376 Auth bypass in TeamCity

What is CVE-2026-49376?

CVE-2026-49376 is a medium-severity authentication bypass vulnerability in Jetbrains Teamcity, published on 29 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In JetBrains TeamCity before 2026.1 insufficient username validation in the SAML plugin

Weakness: CWE-863

Which versions are affected by CVE-2026-49376?

It affects 1 product.

Products include Jetbrains Teamcity.

How do I fix CVE-2026-49376?

No fix has been published for CVE-2026-49376 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-49376 being exploited?

There is no known exploitation of CVE-2026-49376 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-qhvc-3ggx-6rj7.