CVE-2026-46410 in Filebrowser
Summary
by MITRE • 07/20/2026
FileBrowser Quantum is a free, self-hosted, web-based file manager. Versions prior to 1.3.2-stable and 1.4.1-beta may leak some sensitive info, such as source and path. Versions 1.3.2-stable and 1.4.1-beta fix the issue. No known workarounds are available.
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Analysis
by VulDB Data Team • 07/20/2026
FileBrowser Quantum represents a widely-used open-source web-based file management solution that allows users to organize, access, and share files through a browser interface. The vulnerability identified affects versions prior to 1.3.2-stable and 1.4.1-beta, creating a significant security risk through information disclosure mechanisms. This flaw manifests as unauthorized exposure of sensitive system information including source code fragments and directory path structures that should remain confidential within a secure file management environment.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the application's response handling mechanisms. When processing user requests or displaying file listings, the software fails to properly filter or escape potentially sensitive data elements that could inadvertently reveal system internals. This weakness creates an information exposure condition where attackers can obtain unauthorized access to path structures, source code snippets, or other confidential information through carefully crafted requests.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides threat actors with valuable reconnaissance data for subsequent attacks. The leaked path information could enable directory traversal attacks, while exposed source code fragments might reveal implementation details that facilitate exploitation of additional vulnerabilities. This information leakage creates a foundation for more sophisticated attacks including privilege escalation or further system compromise attempts.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-200 (Information Exposure) and represents a classic case of insufficient output filtering that violates secure coding practices. The issue also maps to ATT&CK technique T1592 (Gather Victim Host Information) and T1083 (File and Directory Discovery), as it enables adversaries to collect system reconnaissance data without direct exploitation of other vulnerabilities. Organizations using affected versions face increased risk of targeted attacks leveraging the leaked information for more effective compromise strategies.
The remediation approach requires immediate deployment of patched versions 1.3.2-stable or 1.4.1-beta, as no viable workarounds exist to address this specific information disclosure mechanism. Security teams should conduct comprehensive audits of all FileBrowser Quantum installations to identify affected systems and implement proper patch management procedures. Additionally, organizations should consider implementing network monitoring solutions to detect potential exploitation attempts based on anomalous request patterns that might indicate information gathering activities targeting the vulnerable application.
The vulnerability highlights the critical importance of secure configuration management and regular security updates in web-based applications. FileBrowser Quantum's exposure demonstrates how seemingly benign functionality can become a significant security risk when proper input validation and output sanitization controls are absent from the application architecture. This incident serves as a reminder that even free, self-hosted solutions require rigorous security assessment and timely patch deployment to maintain operational security posture against evolving threat landscapes.