CVE-2026-18435 describes a stored cross-site scripting vulnerability in the Kadence Blocks — Page Builder Toolkit for Gutenberg Editor WordPress plugin. The vulnerability is due to improper neutralization of input during web page generation, specifically in the 'toggleIcon' block attribute. Authenticated attackers with contributor or higher privileges can inject arbitrary scripts that execute in the context of users viewing the compromised pages. This can lead to information disclosure and limited integrity impact. The vulnerability affects all plugin versions up to and including 3.7.8. No official patch or remediation level has been confirmed in the provided data.

An attacker with contributor-level or higher access can inject malicious scripts into pages via the vulnerable 'toggleIcon' attribute. These scripts execute when other users access the injected pages, potentially leading to theft of user credentials, session hijacking, or other actions permitted by the victim's privileges. The confidentiality and integrity of affected sites may be compromised, but availability is not impacted. The CVSS score of 6.4 reflects a medium severity with network attack vector, low attack complexity, and no user interaction required.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider disabling or limiting use of the vulnerable 'toggleIcon' block attribute if possible. Monitor vendor communications for updates and apply patches promptly once released.