CVE-2025-48488 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, deleting the file .htaccess allows an attacker to upload an HTML file containing malicious JavaScript code to the server, which can result in a Cross-Site Scripting (XSS) vulnerability. This issue has been patched in version 1.8.180.
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Analysis
by VulDB Data Team • 05/30/2025
The vulnerability identified as CVE-2025-48488 affects FreeScout, a self-hosted help desk and shared mailbox solution that enables organizations to manage customer support tickets and email communications. This application operates as a web-based platform requiring proper file access controls and upload validation mechanisms to prevent unauthorized modifications to server-side components. The security flaw stems from inadequate file permission controls and validation logic within the application's file management system, particularly concerning the .htaccess file handling during deletion operations. This vulnerability represents a critical security oversight that directly impacts the integrity and confidentiality of the web application environment.
The technical implementation of this vulnerability involves a specific weakness in how FreeScout handles the deletion of the .htaccess file, which serves as a critical configuration file for web server access controls and security policies. When the application deletes this file without proper validation, it creates a temporary window of opportunity for malicious actors to exploit the system. Attackers can leverage this condition to upload HTML files containing malicious JavaScript code, effectively bypassing normal security restrictions that would typically prevent such uploads. The vulnerability specifically enables unauthorized file uploads that can execute arbitrary code within the browser context of legitimate users, making it a classic Cross-Site Scripting (XSS) vector. This flaw operates at the intersection of improper file handling and insufficient input validation, creating an exploitable path that violates fundamental security principles of web application development.
The operational impact of this vulnerability extends beyond simple code execution, as it allows attackers to compromise user sessions and potentially escalate privileges within the application environment. The XSS payload can be triggered when authenticated users view affected pages, enabling attackers to steal session cookies, redirect users to malicious sites, or perform actions on behalf of legitimate users. This vulnerability directly violates security controls established under the OWASP Top Ten, specifically addressing injection flaws and insecure design principles. The attack surface is particularly concerning for help desk applications where users frequently access sensitive customer data and communication records, making this vulnerability a potential vector for data exfiltration and privilege escalation. Organizations using affected versions of FreeScout face significant risk of unauthorized access and potential data breaches.
Mitigation strategies for CVE-2025-48488 require immediate action to upgrade to FreeScout version 1.8.180 or later, which contains the necessary patches to address the file handling vulnerability. System administrators should implement comprehensive file access monitoring and validation mechanisms to prevent unauthorized deletion of critical configuration files like .htaccess. The remediation process involves not only updating the application but also conducting thorough security audits of file permissions and access controls within the web server environment. Organizations should consider implementing additional security layers such as web application firewalls and content security policies to prevent unauthorized file uploads. This vulnerability aligns with ATT&CK technique T1505.003 for Application Shimming and demonstrates the importance of proper input validation and file system security controls. Regular security assessments and vulnerability scanning should be implemented to identify similar issues in other web applications and prevent similar exploitation vectors from being discovered and leveraged by threat actors.