CVE-2025-23439

CVE-2025-23439 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the TinyMCE Extended Config WordPress plugin by willshouse. The issue affects all versions of the tinymce-extended-config plugin from n/a through 0.1.0 inclusive. Published on 2025-03-03, it carries a CVSS v3.1 base score of 7.1 (High).

Attackers can exploit this vulnerability remotely over the network (AV:N) with low attack complexity (AC:L), requiring no privileges (PR:N) but user interaction (UI:R), such as visiting a maliciously crafted URL. The changed scope (S:C) enables execution of arbitrary JavaScript in the victim's browser context, resulting in low impacts to confidentiality, integrity, and availability (C:L/I:L/A:L). Potential outcomes include session hijacking, data theft, or phishing within the authenticated user's session.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/tinymce-extended-config/vulnerability/wordpress-tinymce-extended-config-plugin-0-1-0-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve details the vulnerability in the WordPress TinyMCE Extended Config plugin version 0.1.0 and provides guidance on mitigation.