CVE-2026-49371 Cross-site scripting in TeamCity

What is CVE-2026-49371?

CVE-2026-49371 is a high-severity cross-site scripting vulnerability in Jetbrains Teamcity, published on 29 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

In JetBrains TeamCity before 2026.1.1 reflected XSS in the keyword filter was possible

Weakness: CWE-79

Which versions are affected by CVE-2026-49371?

It affects 1 product.

Products include Jetbrains Teamcity.

How do I fix CVE-2026-49371?

No fix has been published for CVE-2026-49371 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-49371 being exploited?

There is no known exploitation of CVE-2026-49371 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-jjhv-75hw-cg7g.