CVE-2025-23439

Vulnerability

Overview

CVE-2025-23439 is a reflected cross-site scripting (XSS) vulnerability in the WordPress plugin Tinymce Extended Config, affecting all versions up to and including 0.1.0. The issue stems from improper neutralization of user input during web page generation, allowing an attacker to inject arbitrary JavaScript code into a response. [1]

Exploitation

Exploitation requires user interaction, such as clicking a crafted link or visiting a malicious page. An attacker with no special privileges can trigger the vulnerability by tricking a privileged user (e.g., an administrator) into performing an action, such as following a URL. The reflected XSS is executed in the context of the victim's browser session. [1]

Impact

Successful exploitation enables the attacker to execute arbitrary scripts in the victim's browser. This can be used to perform actions like redirecting visitors to malicious sites, injecting advertisements, or stealing sensitive information such as cookies or session tokens. [1]

Mitigation

The vendor has not yet released a patch, but users are advised to update the plugin as soon as a fix becomes available. As an interim measure, Patchstack provides a mitigation rule that blocks attacks until an official update is deployed. [1]