CVE-2026-75496 in QloApps
Summary
by MITRE • 08/25/2026
Webkul QloApps does not perform proper validation on uploaded file extensions or MIME types before moving the file to a publicly accessible directory. A remote, authenticated attacker with administrative privileges could upload executable files and achieve remote code execution. Fixed in 153ec1c.
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Analysis
by VulDB Data Team • 08/25/2026
The vulnerability identified in Webkul QloApps represents a critical failure in input validation mechanisms specifically related to file uploads. This flaw allows an attacker who has obtained authenticated access with administrative privileges to bypass security controls designed to restrict the types of files that can be stored on the server. The core technical issue lies in the application's handling of uploaded content, where it fails to rigorously validate either the file extension or the MIME type before processing and storing the file within a publicly accessible directory structure. This lack of strict enforcement creates a direct pathway for malicious actors to introduce executable scripts into areas of the web server that are directly reachable via HTTP requests, thereby compromising the integrity and availability of the entire system.
From a technical perspective, this vulnerability is classified under CWE-434, which describes an unrestricted upload of file with dangerous type. The absence of proper validation means that the application likely relies on client-side checks or weak server-side heuristics that can be easily circumvented using standard web manipulation tools. By crafting a request that mimics legitimate traffic but contains executable code disguised as a different file format, such as embedding PHP shellcode within an image file header or renaming a script to have a benign extension like .jpg while maintaining its executable content, the attacker successfully uploads the payload. Once stored in a public directory, these files become accessible via standard web URLs, allowing for immediate execution by any user who can access that URL, including unauthenticated visitors if the server configuration permits it.
The operational impact of this vulnerability is severe, leading directly to Remote Code Execution (RCE). An attacker with administrative privileges does not need further privilege escalation because they already possess the necessary permissions to upload files; however, the consequence of those actions extends far beyond simple file storage. By executing arbitrary code on the server, the attacker can gain full control over the underlying operating system. This enables them to exfiltrate sensitive customer data, modify application logic, install backdoors for persistent access, or use the compromised server as a pivot point for attacking other internal network resources. The presence of administrative privileges amplifies this risk significantly, as it ensures that the attacker can perform actions such as modifying configuration files or accessing database credentials if they are stored in accessible locations within the web root.
This vulnerability aligns with several techniques observed in real-world attack scenarios and is mapped to MITRE ATT&CK framework entries related to Initial Access and Execution. Specifically, it corresponds to Tactic TA0001: Initial Access via Technique T1505.003: Web Shell, where attackers upload a web shell to maintain persistent access or facilitate further exploitation. Additionally, the act of uploading malicious files relates to Tactic TA0002: Execution and Technique T1059: Command and Scripting Interpreter, as the uploaded file serves as a vehicle for executing system commands through the web server's interpreter engine. The combination of administrative privileges with this upload flaw creates a high-severity risk profile that demands immediate remediation to prevent complete compromise of the e-commerce platform hosted by QloApps.
Mitigation strategies must focus on implementing robust, server-side validation controls that are resistant to manipulation. Developers should enforce strict allow-listing for file extensions and MIME types rather than relying on deny lists or client-side checks alone. It is essential to validate both the magic bytes of the uploaded file against its claimed extension to prevent content-type spoofing. Furthermore, files should be stored outside of publicly accessible directories whenever possible, or if they must reside in public paths, their execution permissions should be explicitly disabled at the web server configuration level using directives such as Apache's <FilesMatch> or Nginx location blocks that deny script execution for specific file types. Regular security audits and static code analysis tools can help identify similar vulnerabilities across other modules of the application to ensure comprehensive protection against unrestricted upload attacks.