CVE-2022-3126 in Frontend File Manager Plugin Plugin
Summary
by MITRE • 10/17/2022
The Frontend File Manager Plugin WordPress plugin before 21.4 does not have CSRF check when uploading files, which could allow attackers to make logged in users upload files on their behalf
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Analysis
by VulDB Data Team • 05/14/2025
The Frontend File Manager Plugin for WordPress represents a significant security vulnerability classified as CVE-2022-3126, where the plugin version prior to 21.4 lacks proper cross-site request forgery protection mechanisms during file upload operations. This flaw exists within the plugin's frontend file management functionality, which allows users to upload files directly through the WordPress interface. The absence of CSRF tokens or validation checks creates an exploitable condition that enables malicious actors to manipulate authenticated users into performing unintended file upload actions without their knowledge or consent. The vulnerability specifically targets the file upload endpoint within the plugin's architecture, where the system fails to verify the authenticity of the request origin, making it susceptible to unauthorized operations.
This technical weakness directly relates to CWE-352, which categorizes cross-site request forgery vulnerabilities as a critical security flaw in web applications. The vulnerability operates through a sophisticated attack vector where an attacker crafts a malicious webpage or embeds malicious code within another website that, when visited by an authenticated WordPress user, automatically triggers the file upload functionality. The attacker does not require direct access to the WordPress installation or administrative credentials, as the exploit leverages the existing authentication state of the victim user. The CSRF protection mechanism that should validate the request source and ensure user intent is completely absent, allowing the malicious request to be processed as if it originated from the legitimate user interface.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it provides attackers with a potential foothold for further exploitation within the WordPress environment. When logged-in users perform file uploads without CSRF protection, attackers can potentially upload malicious files such as web shells, malware, or phishing materials that can compromise the entire WordPress installation. The vulnerability affects the integrity of the file management system and can lead to complete compromise of the website if the uploaded files are executable or contain malicious code. Additionally, the vulnerability may enable attackers to perform persistent modifications to the website's content, potentially leading to data exfiltration, service disruption, or redirection of traffic to malicious destinations.
Mitigation strategies for CVE-2022-3126 require immediate action to upgrade the Frontend File Manager Plugin to version 21.4 or later, where the CSRF protection mechanisms have been implemented. Organizations should conduct thorough security assessments of their WordPress installations to identify all instances of the vulnerable plugin and ensure comprehensive patch management protocols are in place. Security teams should implement additional monitoring for unusual file upload patterns and establish network-based intrusion detection systems to identify potential exploitation attempts. The vulnerability also highlights the importance of maintaining up-to-date security practices and adhering to the principle of least privilege when configuring WordPress plugins, as well as implementing proper input validation and request origin verification mechanisms. Furthermore, administrators should consider implementing web application firewalls and additional security layers to protect against similar CSRF vulnerabilities in other components of the WordPress ecosystem, aligning with ATT&CK technique T1190 for exploiting vulnerabilities in web applications.