CVE-2025-48489 in freescout
Summary
by MITRE • 05/30/2025
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.180, the application is vulnerable to Cross-Site Scripting (XSS) attacks due to insufficient data validation and sanitization during data reception. This issue has been patched in version 1.8.180.
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Analysis
by VulDB Data Team • 05/30/2025
FreeScout represents a self-hosted help desk and shared mailbox solution that has been identified with a cross-site scripting vulnerability affecting versions prior to 1.8.180. This vulnerability stems from inadequate input validation and data sanitization mechanisms within the application's data reception processes. The flaw allows malicious actors to inject malicious scripts into web pages viewed by other users, potentially leading to unauthorized access to sensitive information or system compromise. The vulnerability specifically manifests when the application fails to properly sanitize user-supplied data before rendering it in web responses, creating an avenue for attackers to execute malicious code within the context of a victim's browser session.
The technical nature of this vulnerability places it squarely within the scope of CWE-79 which defines Cross-Site Scripting as a common web application security flaw occurring when user input is improperly validated or sanitized before being rendered in web pages. This weakness enables attackers to inject client-side scripts into web pages that are subsequently executed by other users. The attack vector typically involves manipulation of input fields, URL parameters, or API endpoints where user data is processed and displayed without adequate sanitization measures. In the context of FreeScout's help desk functionality, this could occur when handling ticket descriptions, user comments, or any other user-generated content that gets rendered in the web interface.
The operational impact of this vulnerability extends beyond simple script execution as it fundamentally compromises the security posture of the help desk system. An attacker could exploit this weakness to steal session cookies, redirect users to malicious websites, or even escalate privileges within the application if proper access controls are not in place. The shared mailbox functionality of FreeScout makes this particularly concerning as it could allow unauthorized access to sensitive customer communications or internal business information. The vulnerability also aligns with ATT&CK technique T1566 which covers social engineering attacks through malicious content, potentially enabling attackers to establish persistent access to the help desk environment and compromise the integrity of customer support communications.
Mitigation strategies for this vulnerability require immediate deployment of version 1.8.180 which includes proper input validation and sanitization measures. Organizations should implement comprehensive input sanitization at multiple layers including client-side validation, server-side data processing, and output encoding to prevent script execution in web responses. Security teams should conduct thorough penetration testing to identify any potential exploitation paths within the application's user interface and API endpoints. Additionally, implementing content security policies and regular security audits of web applications can help prevent similar vulnerabilities from emerging in the future. The fix should also include proper logging and monitoring of suspicious input patterns to detect potential exploitation attempts and maintain an audit trail for security incident response activities.