CVE-2026-67678 in Hithub DocSys
Summary
by MITRE • 08/17/2026
File Upload vulnerability in RainyGao-Hithub DocSys v.2.02.80 allows a remote attacker to execute arbitrary code
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Analysis
by VulDB Data Team • 08/17/2026
The identified vulnerability represents a critical security flaw within the file upload functionality of RainyGao Hithub DocSys version 2.02.80, classified under CWE-434 as an Unrestricted Upload of File with Dangerous Type. This weakness stems from insufficient validation mechanisms on the server side when processing user-supplied files. Specifically, the application fails to adequately verify the file extension, content type, or magic bytes before storing the uploaded asset in a publicly accessible directory. By exploiting this lack of input sanitization and restriction logic, an unauthenticated remote attacker can bypass standard security controls designed to prevent malicious code execution through web applications.
The technical exploitation involves crafting a request that submits a specially constructed file containing executable server-side script code, such as PHP, ASP, or JSP payloads, disguised with a benign extension like .jpg or .png, or simply without an extension if the filter is based solely on MIME type detection which can be spoofed. Once uploaded to a directory where web scripts are interpreted by the underlying application server, the attacker gains the ability to trigger arbitrary code execution. This process typically involves uploading the malicious file and then issuing a subsequent HTTP request to access that specific file path via the web root, causing the server engine to parse and execute the embedded script commands rather than treating it as static data.
The operational impact of this vulnerability is severe, effectively resulting in full system compromise depending on the privileges under which the web application process runs. An attacker can achieve remote code execution (RCE), allowing them to read sensitive configuration files, extract database credentials, modify or delete critical application data, and potentially pivot further into the internal network infrastructure. This aligns with MITRE ATT&CK technique T1505.003, Web Shell: Server-Side Script, where attackers establish a persistent backdoor for continued access and lateral movement. The integrity of the entire information system is compromised as the attacker obtains administrative-level control over the hosting environment without requiring valid user credentials or prior authentication.
Mitigation strategies must focus on implementing robust file upload controls immediately. Administrators should enforce strict allow-listing of permitted file extensions, ensuring that only expected document types such as .pdf, .docx, and .xlsx are accepted while explicitly blocking executable script formats like .php, .jsp, .asp, and .sh. Additionally, the application must validate files using multiple methods including checking MIME types against actual content signatures rather than relying solely on client-supplied headers. Uploaded files should be stored outside of any web-accessible directories to prevent direct execution via HTTP requests; if storage within a public directory is unavoidable, file names should be randomized and executed permissions stripped from the uploaded assets at the operating system level. Regular security audits and static code analysis tools can help identify similar weaknesses in other parts of the application logic before they are exploited in production environments.