Is CVE-2026-49377 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-49377 being exploited in the wild.

How severe is CVE-2026-49377?

Medium severity, with a CVSS score of 4.3, published 29 May 2026.

Which products and versions are affected?

Jetbrains TeamCity before 2025.11.2.

Is there a fix for CVE-2026-49377?

A patch was published on 2026-05-29: Fixed in version 2025.11.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-49377 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-49377?

Check whether you run Jetbrains TeamCity at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-49377: JetBrains TeamCity sensitive data exposure in default agent parameters

CVE-2026-49377 · Severity: medium · CVSS 4.3 · Published 2026-05-29

JetBrains TeamCity, a platform used by software teams to automate building and testing code, contains a vulnerability that could expose sensitive information. An authenticated user could potentially view configuration details or environment variables that should remain private. This exposure could lead to the leak of internal system details, though it does not directly allow for system takeover or data destruction.

Technologies: Jetbrains TeamCity. Vendors: Jetbrains.

Quick answers

Is CVE-2026-49377 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-49377 being exploited in the wild.
How severe is CVE-2026-49377?: Medium severity, with a CVSS score of 4.3, published 29 May 2026.
Which products and versions are affected?: Jetbrains TeamCity before 2025.11.2.
Is there a fix for CVE-2026-49377?: A patch was published on 2026-05-29: Fixed in version 2025.11.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-49377 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-49377?: Check whether you run Jetbrains TeamCity at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

JetBrains TeamCity versions prior to 2025.11.2 are vulnerable to the exposure of sensitive information through environmental variables (CWE-526). The flaw exists in how default agent parameters are handled, potentially leaking sensitive configuration data to authenticated users. An attacker with low-privileged network access can exploit this to gain insight into the build environment without requiring user interaction. The issue is addressed in version 2025.11.2.

Affected products

JetBrains TeamCity before 2025.11.2

Timeline

2026-05-29: advisory: CVE-2026-49377 published by JetBrains
2026-05-29: patched: Fixed in version 2025.11.2

References

https://www.jetbrains.com/privacy-security/issues-fixed/

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