CVE-2025-23840

CVE-2025-23840 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as reflected cross-site scripting (XSS) under CWE-79. It affects the WP-NOTCAPTCHA WordPress plugin by webjema WP-NOTCAPTCHA wp-notcaptcha, impacting all versions from n/a through 1.3.1.

The vulnerability carries a CVSS v3.1 base score of 7.1 (High) with the vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L. Remote attackers require no privileges and can exploit it over the network with low attack complexity, though it demands user interaction such as clicking a malicious link. Exploitation enables limited impacts on confidentiality, integrity, and availability, with a changed scope that may affect other users or resources via the injected script executing in the victim's browser context.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/wp-notcaptcha/vulnerability/wordpress-wp-notcaptcha-plugin-1-3-1-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve documents the reflected XSS flaw in WP-NOTCAPTCHA version 1.3.1 and serves as the primary reference for mitigation details.