CVE-2024-12466 in Proofreading Plugin
Summary
by MITRE • 01/17/2025
The Proofreading plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'nonce' parameter in all versions up to, and including, 1.2.1.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 02/10/2025
The Proofreading plugin for WordPress represents a critical security vulnerability that affects versions up to and including 1.2.1.1, exposing systems to reflected cross-site scripting attacks through improper handling of the nonce parameter. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically classified as reflected XSS where malicious scripts are executed in the victim's browser through crafted input. The flaw occurs when the plugin fails to properly sanitize user-supplied input and inadequately escape output, creating an attack surface that allows malicious actors to inject arbitrary JavaScript code into web pages.
The technical implementation of this vulnerability stems from the plugin's insufficient validation of the nonce parameter, which is typically used to verify the integrity of requests and prevent CSRF attacks. However, in this case, the parameter is not properly sanitized before being rendered in the browser context, creating an opportunity for attackers to inject malicious payloads. The reflected nature of this vulnerability means that the malicious script is reflected off the web server and executed in the victim's browser, requiring no persistent storage or complex attack vectors. Attackers can exploit this by crafting malicious URLs containing script payloads and sending them to unsuspecting users through social engineering tactics.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform a wide range of malicious activities including session hijacking, credential theft, and redirection to malicious websites. The vulnerability is particularly dangerous because it affects unauthenticated attackers, meaning no prior access or credentials are required to exploit the flaw. This creates a significant risk for WordPress sites using the Proofreading plugin, as users can be tricked into clicking malicious links without any knowledge of the underlying attack. The attack vector typically involves phishing campaigns where users are lured into clicking links that contain the malicious script payload, which then executes in their browser when they visit the affected page.
Security professionals should prioritize immediate remediation of this vulnerability by upgrading to the latest version of the Proofreading plugin where the XSS flaw has been addressed through proper input sanitization and output escaping mechanisms. The mitigation strategy should include implementing proper parameter validation and ensuring all user-supplied input is properly escaped before rendering in HTML contexts. Organizations should also consider implementing web application firewalls and content security policies as additional defensive measures. This vulnerability aligns with ATT&CK technique T1566.001 for phishing and T1203 for exploitation for client execution, highlighting the need for comprehensive security awareness training and network monitoring to detect and prevent such attacks. The vulnerability demonstrates the critical importance of proper input validation and output escaping in web applications, particularly in plugins that handle user interactions and request parameters.