CVE-2025-23732 in Easy Filtering Plugin
Summary
by MITRE • 01/22/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NotFound Easy Filtering allows Reflected XSS. This issue affects Easy Filtering: from n/a through 2.5.0.
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Analysis
by VulDB Data Team • 02/09/2025
The vulnerability identified as CVE-2025-23732 represents a critical cross-site scripting flaw within the NotFound Easy Filtering plugin, specifically impacting versions ranging from the initial release through 2.5.0. This issue falls under the well-documented category of CWE-79 - Improper Neutralization of Input During Web Page Generation, which serves as the foundational weakness enabling malicious script execution in web applications. The vulnerability manifests as a reflected cross-site scripting condition where user-supplied input is inadequately sanitized before being incorporated into dynamically generated web pages, creating an attack vector that allows malicious actors to inject executable scripts into web browsers of unsuspecting users.
The technical implementation of this vulnerability occurs when the Easy Filtering plugin processes user input through HTTP request parameters without proper input validation or output encoding mechanisms. When a malicious user crafts a specially formatted request containing script payloads, the plugin fails to neutralize these inputs before rendering them within the web page context. This failure creates a reflected XSS condition where the malicious script executes in the victim's browser context, potentially allowing attackers to hijack user sessions, steal sensitive information, or perform unauthorized actions on behalf of the victim. The reflected nature of this vulnerability means that the malicious payload is immediately reflected back to the user through the application's response, making exploitation straightforward and immediate.
The operational impact of this vulnerability extends beyond simple script injection, as it enables attackers to leverage the trust relationship between the victim and the vulnerable web application. Attackers can craft malicious URLs that, when clicked by victims, execute scripts in their browsers to steal cookies, session tokens, or other sensitive data. The vulnerability affects the entire user base of the Easy Filtering plugin, particularly those using WordPress environments where the plugin is installed, potentially compromising thousands of websites. This type of vulnerability directly aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, where attackers can use the reflected XSS to deliver malicious payloads that exploit the victim's browser session. The vulnerability's scope includes not only the immediate script execution but also potential privilege escalation if the affected users possess administrative capabilities within the WordPress environment.
Mitigation strategies for CVE-2025-23732 require immediate action including updating the Easy Filtering plugin to the latest version where the XSS vulnerability has been addressed through proper input sanitization and output encoding mechanisms. Organizations should implement comprehensive input validation that filters or encodes all user-supplied data before it is processed or displayed within web pages. The implementation of Content Security Policy headers provides an additional layer of protection by restricting the sources from which scripts can be executed, effectively mitigating the impact of reflected XSS attacks even if other defenses fail. Security measures should also include regular vulnerability scanning and monitoring of plugin repositories for security updates, as well as implementing web application firewalls that can detect and block malicious script injection attempts. Additionally, user education regarding the dangers of clicking suspicious links and the importance of keeping software updated plays a crucial role in preventing exploitation of this vulnerability. The remediation process must also involve thorough testing of the updated plugin to ensure that the XSS fix does not introduce regressions in functionality while maintaining the plugin's core filtering capabilities.