CVE-2025-46491 in Multi-Column Taxonomy List Plugin
Summary
by MITRE • 04/24/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Matthew Muro Multi-Column Taxonomy List allows Stored XSS. This issue affects Multi-Column Taxonomy List: from n/a through 1.5.
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Analysis
by VulDB Data Team • 04/24/2025
This vulnerability represents a critical cross-site scripting flaw in the Matthew Muro Multi-Column Taxonomy List plugin for WordPress, categorized under CWE-79 Improper Neutralization of Input During Web Page Generation. The vulnerability allows attackers to inject malicious scripts into web pages that are then executed in the context of other users' browsers. The issue manifests as a stored XSS vulnerability, meaning that malicious payloads persist in the application's database and are served to users whenever they access affected pages. This particular flaw affects all versions of the plugin from the initial release through version 1.5, indicating a long-standing security weakness that has not been properly addressed. The vulnerability occurs during the web page generation process when user-supplied input is not adequately sanitized or escaped before being rendered in HTML output.
The technical exploitation of this vulnerability requires an attacker to leverage the plugin's functionality that handles taxonomy data display, particularly in multi-column layouts. When users interact with the plugin's interface or view pages that utilize the affected taxonomy display features, the malicious scripts embedded in the input fields are executed in the browsers of other users. This stored nature of the vulnerability means that the attack payload is not limited to a single request but remains active in the system until manually removed or patched. The flaw likely occurs when the plugin processes user input through form fields, taxonomy descriptions, or other editable content areas without proper HTML escaping or context-appropriate sanitization mechanisms. The impact is particularly severe because the vulnerability affects the plugin's core functionality of displaying taxonomy data, which is commonly used throughout WordPress sites for organizing and presenting content.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the ability to perform session hijacking, steal cookies, redirect users to malicious sites, or even perform actions on behalf of authenticated users. An attacker could potentially exploit this vulnerability to gain unauthorized access to administrator accounts, modify site content, or exfiltrate sensitive data from users who visit affected pages. The stored nature of the XSS means that even users who do not directly interact with the vulnerable input fields can be compromised simply by viewing pages that display the malicious content. This makes the vulnerability particularly dangerous in environments where multiple users access the same WordPress installation, as a single compromised input can affect numerous site visitors. The vulnerability's presence in versions through 1.5 indicates that organizations using this plugin for taxonomy management are at risk, particularly in environments where plugin updates are not regularly applied.
Organizations should immediately implement multiple layers of defense to mitigate the risks associated with this stored XSS vulnerability. The primary mitigation strategy involves updating to the latest version of the Matthew Muro Multi-Column Taxonomy List plugin where the vulnerability has been patched. System administrators should also implement input validation and output escaping mechanisms at the application level, ensuring that all user-supplied content is properly sanitized before being stored or displayed. Additional protective measures include implementing content security policies that restrict script execution, monitoring user input for suspicious patterns, and conducting regular security audits of installed plugins. The vulnerability demonstrates the importance of proper input validation and output encoding practices as outlined in the OWASP Top Ten and MITRE ATT&CK framework's techniques for command and control operations. Organizations should also consider implementing web application firewalls to detect and block malicious script injection attempts, while maintaining regular security assessments of their WordPress installations to identify other potential vulnerabilities in the plugin ecosystem.