CVE-2025-12973 in S2B AI Assistant Plugin
Summary
by MITRE • 11/21/2025
The S2B AI Assistant – ChatBot, ChatGPT, OpenAI, Content & Image Generator plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the storeFile() function in all versions up to, and including, 1.7.8. This makes it possible for authenticated attackers, with Editor-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.
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Analysis
by VulDB Data Team • 11/21/2025
The vulnerability identified as CVE-2025-12973 affects the S2B AI Assistant plugin for WordPress, specifically targeting versions up to and including 1.7.8. This plugin serves as an AI-powered chatbot and content generation tool that integrates with various AI services including ChatGPT and OpenAI. The flaw resides within the storeFile() function which handles file storage operations, creating a critical security gap that could be exploited by malicious actors with sufficient privileges. The vulnerability represents a significant risk to WordPress installations as it allows authenticated attackers with Editor-level permissions or higher to bypass normal file upload restrictions and potentially gain unauthorized access to the underlying server infrastructure.
The technical implementation of this vulnerability stems from inadequate input validation within the file upload mechanism. The storeFile() function fails to properly validate file types before storing uploaded content on the server, creating an opportunity for attackers to upload malicious files with extensions that should be restricted. This missing validation allows attackers to upload files with potentially dangerous extensions such as php, aspx, or other server-side script formats that could execute code on the target system. The vulnerability aligns with CWE-434 which specifically addresses insecure file upload handling, where the system accepts files without proper validation of their content or type, leading to potential code execution and system compromise.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it creates a potential pathway for remote code execution attacks. An attacker with Editor-level privileges can leverage this flaw to upload malicious files that could be executed by the web server, potentially leading to complete system compromise. This risk is particularly severe in WordPress environments where plugins often have elevated privileges and may be installed on servers with sensitive data or applications. The vulnerability affects not just the immediate plugin functionality but could enable attackers to establish persistent access, escalate privileges, or use the compromised server as a launchpad for further attacks against other systems within the network infrastructure.
Organizations should implement immediate mitigation strategies to address this vulnerability, including updating to the latest plugin version where the issue has been resolved through proper file type validation. The fix should implement strict file extension filtering and content validation to prevent unauthorized uploads of potentially dangerous file types. Security measures should also include monitoring for unusual file upload activities and implementing additional access controls for plugin management functions. According to ATT&CK framework, this vulnerability maps to T1190 - Exploit Public-Facing Application, where attackers leverage application weaknesses to gain unauthorized access, and T1059 - Command and Scripting Interpreter, which could be employed through uploaded malicious scripts. Organizations should also consider implementing web application firewalls and regular security audits to detect and prevent similar vulnerabilities in other installed plugins and themes.