CVE-2024-41826 in TeamCity
Summary
by MITRE • 07/22/2024
In JetBrains TeamCity before 2024.07 stored XSS was possible on Show Connection page
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 03/17/2025
The vulnerability in JetBrains TeamCity prior to version 2024.07 represents a stored cross-site scripting flaw that specifically affects the Show Connection page functionality. This type of vulnerability allows attackers to inject malicious scripts into the application's database through user-controllable input fields, which are then executed when other users view the affected page. The stored nature of this XSS vulnerability means that the malicious payload persists in the system and can affect multiple users over time rather than requiring immediate exploitation through a single request.
The technical flaw stems from insufficient input validation and output encoding mechanisms within the connection management interface. When users configure or view connection details, the application fails to properly sanitize user-supplied data before rendering it in the web interface. This allows malicious actors to craft connection names, URLs, or other configurable parameters containing script tags that execute in the context of other users' browsers. The vulnerability specifically targets the Show Connection page where connection information is displayed, making it particularly dangerous as administrators and developers frequently interact with these pages during routine operations.
The operational impact of this stored XSS vulnerability is significant within TeamCity environments, as it can be exploited to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious sites. Attackers could potentially escalate privileges by injecting scripts that capture authentication tokens or modify build configurations. The vulnerability affects all users who can view connection details, including administrators, developers, and project managers, making it a critical concern for continuous integration environments where sensitive build information and credentials are often stored in connection configurations.
Security mitigations for this vulnerability include upgrading to TeamCity version 2024.07 or later, which implements proper input sanitization and output encoding mechanisms. Organizations should also implement additional defensive measures such as content security policies that restrict script execution, regular security scanning of configuration parameters, and monitoring for anomalous connection configurations. The vulnerability aligns with CWE-79 Cross-site Scripting and follows patterns consistent with ATT&CK technique T1566.002 Phishing via Social Media, where attackers leverage user-facing interfaces to deliver malicious payloads. Organizations should conduct thorough penetration testing of their TeamCity installations to identify similar vulnerabilities in other configurable pages and ensure that all user-supplied data is properly validated before persistence or display.
The remediation process requires careful attention to input validation across all connection configuration fields while maintaining functionality for legitimate use cases. Security teams should implement automated scanning tools to detect malformed connection parameters and establish incident response procedures for identifying when XSS payloads have been successfully injected into the system. Regular security awareness training for administrators about the dangers of untrusted connection configurations can also help prevent exploitation through social engineering attacks that might attempt to trick users into entering malicious data.