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CVE-2025-57731: Stored XSS Vulnerability in JetBrains YouTrack

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Overview

In the world of cybersecurity, new vulnerabilities are constantly surfacing, presenting a consistent challenge for businesses and developers alike. Today, we are going to discuss a recently discovered vulnerability: CVE-2025-57731, a stored Cross-Site Scripting (XSS) vulnerability found in JetBrains YouTrack. This vulnerability has a significant impact on JetBrains YouTrack versions before 2025.2.92387, making it a crucial issue to address for any organization using this product.
Cross-Site Scripting is a persistent threat in modern web applications, allowing attackers to inject malicious scripts into web pages viewed by other users. In this instance, the vulnerability lies in the Mermaid diagram content, raising concerns about potential system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-57731
Severity: High (8.7 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

JetBrains YouTrack | Versions before 2025.2.92387

How the Exploit Works

The vulnerability arises from the ability to store XSS payloads in the Mermaid diagram content within JetBrains YouTrack. Due to insufficient sanitization, the application does not properly filter user-supplied input. Consequently, an attacker can inject malicious scripts that are executed when users view the Mermaid diagrams.
When an unsuspecting user views the manipulated diagram, the malicious script is executed in the browser’s context, potentially leading to unauthorized access, data theft, or other harmful actions.

Conceptual Example Code

Below is a conceptual example of how this vulnerability might be exploited.

POST /youtrack/mermaidDiagram HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"mermaid_content": "<script>malicious_code_here</script>"
}

In this example, the POST request sends a payload containing a malicious script to the endpoint handling the Mermaid diagrams. When a user subsequently views the diagram, the script is executed, potentially leading to a successful exploit.
To mitigate this vulnerability, apply the vendor-recommended patch as soon as possible. If that is not immediately feasible, consider using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) for temporary mitigation.

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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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