CVE-2023-5241 in AI ChatBot Plugin
Summary
by MITRE • 10/25/2023
The AI ChatBot for WordPress is vulnerable to Directory Traversal in versions up to, and including, 4.8.9 as well as 4.9.2 via the qcld_openai_upload_pagetraining_file function. This allows subscriber-level attackers to append "<?php" to any existing file on the server resulting in potential DoS when appended to critical files such as wp-config.php.
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Analysis
by VulDB Data Team • 04/10/2026
The vulnerability identified as CVE-2023-5241 affects the AI ChatBot plugin for WordPress, specifically targeting versions up to and including 4.8.9 and 4.9.2. This represents a critical security flaw that undermines the integrity of WordPress installations by enabling unauthorized file manipulation through a directory traversal exploit. The vulnerability stems from insufficient input validation within the qcld_openai_upload_pagetraining_file function, which processes file uploads and training data for the chatbot functionality. Attackers with subscriber-level privileges can leverage this weakness to manipulate files on the target server, creating a significant escalation path from low-privilege access to potential system compromise.
The technical implementation of this vulnerability involves a directory traversal attack that allows malicious actors to append PHP code to existing files on the server filesystem. When an attacker uploads a specially crafted file through the vulnerable function, the system fails to properly sanitize the file path or content, enabling the insertion of "<?php" tags into arbitrary files. This manipulation can be particularly devastating when targeting critical system files such as wp-config.php, which contains database credentials and cryptographic keys essential for WordPress operation. The insertion of PHP code into these files creates potential for remote code execution or denial of service conditions, depending on how the injected code is processed by the web server.
The operational impact of CVE-2023-5241 extends beyond simple file corruption, as it provides attackers with a method to establish persistent access or disrupt service availability. A successful exploitation could lead to complete system compromise, data exfiltration, or the deployment of malicious payloads that persist across system reboots. The vulnerability's classification under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) aligns with common attack patterns that exploit insufficient input validation in web applications. From an adversary perspective, this vulnerability maps to ATT&CK technique T1078.004 (Valid Accounts: Cloud Accounts) and T1566.001 (Phishing: Spearphishing Attachment) as attackers can leverage compromised subscriber accounts to gain access to the vulnerable plugin functionality. The low privilege requirement makes this vulnerability particularly dangerous as it can be exploited by attackers who have gained minimal access to the WordPress system.
Mitigation strategies for CVE-2023-5241 should prioritize immediate plugin updates to versions that address the directory traversal vulnerability. System administrators must implement strict file upload restrictions and validate all file paths through proper input sanitization routines. The WordPress security community recommends disabling the vulnerable plugin functionality until patches are applied, while also monitoring for suspicious file modifications in the wp-content directory. Additional protective measures include implementing web application firewalls to detect and block malicious file upload attempts, restricting file permissions for critical system files, and conducting regular security audits of plugin installations. Organizations should also consider implementing principle of least privilege access controls to limit the potential impact of compromised subscriber accounts. The vulnerability highlights the importance of proper secure coding practices and input validation in preventing directory traversal attacks that can lead to system-wide compromise.