# CVE-2026-49380: JetBrains TeamCity open redirect in SAML plugin

Source: https://junglewise.ai/threats/cve-2026-49380-jetbrains-teamcity-open-redirect-in-saml-plugin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-29. Updated: 2026-05-29  
License: CC BY 4.0 with a link back

CVE-2026-49380 · Severity: low · CVSS 3.1 · Published 2026-05-29

JetBrains TeamCity, a popular platform for automating software builds and deployments, contained a vulnerability in its SAML authentication plugin. This flaw allows attackers to redirect users from the legitimate TeamCity login page to a malicious website. Such redirects are typically used in phishing campaigns to trick employees into providing their credentials or downloading malware.

Technologies: [Jetbrains TeamCity](https://junglewise.ai/threats/technologies/teamcity). Vendors: [Jetbrains](https://junglewise.ai/threats/vendors/jetbrains).

## Quick answers

**Is CVE-2026-49380 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49380 being exploited in the wild.

**How severe is CVE-2026-49380?** Low severity, with a CVSS score of 3.1, published 29 May 2026.

**Which products and versions are affected?** Jetbrains TeamCity before 2026.1.

**Is there a fix for CVE-2026-49380?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-49380 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-49380?** 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

An open redirect vulnerability (CWE-601) exists in the SAML plugin of JetBrains TeamCity prior to version 2026.1. The flaw is caused by insufficient validation of redirection parameters during the SAML authentication flow. A remote, unauthenticated attacker can exploit this by tricking a user into clicking a specially crafted URL. While the vulnerability does not allow direct data theft, it is a common primitive for phishing attacks or bypassing security controls that rely on domain trust. The issue is resolved in TeamCity version 2026.1.

## Affected products

- JetBrains TeamCity before 2026.1

## Timeline

- 2026-05-29: disclosed
- 2026-05-29: advisory

## References

- [https://www.jetbrains.com/privacy-security/issues-fixed/](https://www.jetbrains.com/privacy-security/issues-fixed/)

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