CVE-2015-10135 in WPshop 2
Summary
by MITRE • 07/19/2025
The WPshop 2 – E-Commerce plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the ajaxUpload function in versions before 1.3.9.6. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected sites server which may make remote code execution possible.
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Analysis
by VulDB Data Team • 12/16/2025
The WPshop 2 – E-Commerce plugin for WordPress represents a significant security vulnerability classified as CVE-2015-10135, which stems from inadequate input validation mechanisms within its ajaxUpload function. This flaw exists in plugin versions prior to 1.3.9.6 and creates a critical pathway for unauthenticated attackers to compromise affected WordPress installations. The vulnerability manifests through the absence of proper file type validation, allowing malicious actors to bypass security controls designed to restrict file uploads to specific, safe formats. This fundamental oversight in the plugin's codebase directly violates established security principles and creates an exploitable condition that can lead to complete system compromise.
The technical implementation of this vulnerability resides in the ajaxUpload function where the plugin fails to validate file extensions, MIME types, or file content against a whitelist of approved formats. Attackers can exploit this weakness by crafting malicious file uploads that bypass the intended security restrictions, potentially uploading files with extensions such as .php, .asp, or other executable formats. The missing validation creates a pathway for attackers to upload web shells, malicious scripts, or other payload files that can be executed on the target server. This type of vulnerability maps directly to CWE-434, which describes "Unrestricted Upload of File with Dangerous Type," and represents a classic example of insecure file upload handling that has been consistently identified as a critical threat vector in web application security assessments.
The operational impact of CVE-2015-10135 extends far beyond simple file upload capabilities, as it provides attackers with a potential gateway to achieve remote code execution on affected systems. Once an attacker successfully uploads a malicious file, they can execute arbitrary code on the web server with the privileges of the web application, potentially leading to full system compromise, data exfiltration, or establishment of persistent backdoors. This vulnerability affects not only the WordPress site itself but can also serve as a foothold for broader network attacks, particularly when the compromised server hosts additional services or applications. The unauthenticated nature of the exploit means that attackers do not require valid credentials to initiate the attack, making it particularly dangerous for publicly accessible web applications. Organizations running vulnerable versions of this plugin face significant risk of unauthorized access, data breaches, and potential regulatory compliance violations.
Mitigation strategies for CVE-2015-10135 focus primarily on immediate plugin updates to version 1.3.9.6 or later, which contain the necessary file validation fixes. Security administrators should also implement additional defensive measures including restricting file upload capabilities to authenticated users only, implementing strict file type whitelisting, and configuring web server-level restrictions to prevent execution of uploaded files in web-accessible directories. Network monitoring should be enhanced to detect unusual file upload activities, and regular security audits should be conducted to identify other potential vulnerabilities in the WordPress ecosystem. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1190 for Exploit Public-Facing Application and T1059 for Command and Scripting Interpreter, representing a clear pathway for attackers to establish persistent access and execute commands on compromised systems. Organizations should also consider implementing web application firewalls and content security policies to provide additional layers of protection against similar vulnerabilities in other components of their web infrastructure.