The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the 'link' attribute in the plugin's blocks does not properly sanitize or escape user input, allowing authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code. This code executes in the context of users who view the compromised pages, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all plugin versions up to 3.2.36. The CVSS 3.1 base score is 6.4, reflecting a network attack vector, low attack complexity, required privileges at the contributor level, no user interaction, and impacts on confidentiality and integrity but not availability. No patch or official fix information is currently available.

An attacker with contributor-level or higher access can inject malicious scripts into pages via the vulnerable 'link' attribute. These scripts execute in the browsers of users who view the infected pages, potentially compromising user sessions or data confidentiality and integrity. The vulnerability does not affect availability. There are no known exploits in the wild as of the published date.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access carefully and consider removing or disabling the affected plugin if possible. Monitor vendor channels for updates regarding patches or temporary mitigations.