CVE-2026-61505 in HFS
Summary
by MITRE • 07/13/2026
Rejetto HFS 3.0.0 through 3.2.0 allows path traversal through the lang query parameter, permitting a remote unauthenticated attacker to read certain JSON files outside the shared folders. Exploitation is constrained to files matching a narrow naming and format pattern, limiting practical impact.
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Analysis
by VulDB Data Team • 07/13/2026
The vulnerability resides in Rejetto HFS versions 3.0.0 through 3.2.0 where a path traversal flaw exists in the lang query parameter handling. This weakness enables remote unauthenticated attackers to access JSON configuration files outside the designated shared directories. The vulnerability stems from inadequate input validation and sanitization of the language parameter, which is processed without proper boundary checks or canonicalization. Attackers can manipulate the lang parameter to traverse directory structures and access sensitive configuration data that should remain isolated within the application's intended file access boundaries.
This path traversal vulnerability operates through a specific exploitation pattern where the attacker crafts malicious input in the lang query parameter to navigate beyond the restricted file system paths. The technical implementation involves improper handling of directory traversal sequences such as ../ or ..\ which allows the application to resolve file paths outside its intended scope. The flaw specifically targets JSON files that match certain naming conventions and format patterns, limiting the attack surface but still presenting a significant security risk. This constraint means that while not all files can be accessed, critical configuration data stored in JSON format remains vulnerable to unauthorized access.
The operational impact of this vulnerability extends beyond simple information disclosure as it enables attackers to gain insights into the application's configuration structure and potentially identify other vulnerabilities within the system. The unauthenticated nature of the attack means that any remote user can exploit this flaw without requiring prior credentials or access privileges, making the vulnerability particularly dangerous in publicly accessible environments. The limited scope of exploitable files reduces the immediate practical impact but does not eliminate the risk entirely, as configuration data may contain sensitive information about file paths, user permissions, or system settings that could aid in subsequent attacks.
Security mitigations for this vulnerability should focus on implementing proper input validation and sanitization of all user-supplied parameters including the lang query parameter. The application should enforce strict path canonicalization and ensure that all file access operations occur within predefined safe directories. Implementing a whitelist approach for acceptable language parameters and applying proper directory traversal prevention mechanisms would effectively neutralize this attack vector. Organizations using affected Rejetto HFS versions should immediately upgrade to patched releases or implement compensating controls such as web application firewalls that can detect and block malicious path traversal attempts. This vulnerability aligns with CWE-22 Path Traversal and follows ATT&CK technique T1083 File and Directory Discovery, highlighting the need for comprehensive defensive measures against file system access control bypasses.
The vulnerability demonstrates a classic insufficient input validation issue that affects web applications processing user-supplied data without proper sanitization. The attack pattern represents a common security misconfiguration where applications fail to properly validate or sanitize parameters that influence file system operations. Organizations should implement regular security assessments and penetration testing to identify similar path traversal vulnerabilities in their web applications, as these flaws often remain undetected until exploited by malicious actors. The limited exploitation scope does not diminish the importance of addressing this vulnerability promptly, as it serves as a potential stepping stone for more sophisticated attacks targeting the underlying system infrastructure and sensitive data repositories.