CVE-2025-61583 in ts3-manager
Summary
by MITRE • 10/02/2025
TS3 Manager is modern web interface for maintaining Teamspeak3 servers. A reflected cross-site scripting vulnerability has been identified in versions 2.2.1 and earlier. The vulnerability exists in the error handling mechanism of the login page, where malicious scripts embedded in server hostnames are executed in the victim's browser context without proper sanitization. This issue is fixed in version 2.2.2.
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Analysis
by VulDB Data Team • 10/20/2025
The vulnerability CVE-2025-61583 represents a critical reflected cross-site scripting flaw in TS3 Manager, a modern web interface designed for Teamspeak3 server administration. This web application serves as a centralized management platform for Teamspeak3 server operations, making it a potentially attractive target for attackers seeking to exploit web application vulnerabilities. The security issue specifically affects versions 2.2.1 and earlier, indicating that the developers have acknowledged and resolved the problem in version 2.2.2, which demonstrates proper vulnerability management practices.
The technical flaw manifests within the error handling mechanism of the login page, where the application fails to properly sanitize user input containing server hostnames. When malicious scripts are embedded in these hostname parameters and subsequently processed by the application, they become reflected back to the user's browser without adequate sanitization or encoding. This creates a classic reflected XSS vulnerability where the malicious payload executes in the context of the victim's browser session, potentially allowing attackers to steal session cookies, perform unauthorized actions, or redirect users to malicious websites. The vulnerability is categorized under CWE-79 as a failure to sanitize or encode user-provided data before returning it to the browser, and it aligns with ATT&CK technique T1566.001 for initial access through malicious web content.
The operational impact of this vulnerability extends beyond simple script execution, as it could enable attackers to compromise user sessions and gain unauthorized access to Teamspeak3 server management capabilities. Since TS3 Manager provides administrative controls over Teamspeak3 servers, successful exploitation could allow attackers to manipulate server configurations, view sensitive communications, or potentially disrupt services. The vulnerability's location in the login error handling mechanism means it could be triggered by various user interactions, including malformed hostname entries or attempts to connect to non-existent servers, making it particularly dangerous as it doesn't require specific user actions beyond normal application usage. Organizations using affected versions should immediately implement mitigation strategies including input validation, output encoding, and application updates to prevent potential exploitation.
The remediation approach for this vulnerability involves upgrading to version 2.2.2 or later, which addresses the sanitization issue in the login page error handling. Additional defensive measures should include implementing proper input validation for all user-provided data, applying output encoding to prevent script execution in browser contexts, and deploying web application firewalls to detect and block malicious payloads. Security teams should also conduct thorough testing to ensure that all user input is properly sanitized, particularly in error handling paths where unexpected data might be returned to users. The vulnerability demonstrates the importance of comprehensive security testing across all application components, including error handling mechanisms that might not be immediately obvious as security-critical areas.