CVE-2026-3498 describes a stored cross-site scripting vulnerability in the BlockArt Blocks plugin for WordPress, affecting all versions up to 2.2.15. The vulnerability is due to improper neutralization of input in the 'clientId' block attribute, allowing authenticated users with Author-level or higher privileges to inject arbitrary web scripts. These scripts execute when any user accesses the compromised page, potentially leading to session hijacking or other script-based attacks. The CVSS score of 6.4 reflects a medium severity with network attack vector, low attack complexity, and privileges required at the Author level.

An attacker with Author-level access or higher can exploit this vulnerability to inject persistent malicious scripts into pages generated by the plugin. These scripts execute in the context of users viewing the infected pages, potentially compromising user sessions or performing unauthorized actions. The impact includes limited confidentiality and integrity loss but no availability impact. There are no reports of active exploitation in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Author-level access to trusted users only and consider disabling or removing the BlockArt Blocks plugin if possible. Monitor vendor channels for updates and apply patches promptly once available.