The WordPress SEO Friendly Accordion FAQ plugin (up to version 2.2.1) suffers from a stored cross-site scripting vulnerability (CWE-79) in its 'noticefaq' shortcode. This occurs because the plugin does not properly sanitize or escape user-supplied attributes, allowing authenticated users with contributor or higher privileges to inject arbitrary JavaScript code. When other users access pages containing the injected code, the scripts execute in their browsers, potentially leading to session hijacking or other client-side attacks. The vulnerability has a CVSS 3.1 score of 6.4, reflecting a medium severity with network attack vector and low complexity. No official patch or remediation has been provided as of the published date.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the context of users viewing the affected pages, potentially compromising user sessions or performing unauthorized actions. The impact is limited to confidentiality and integrity loss at the client side, with no direct availability impact. There are no known active exploits reported.

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 removing the vulnerable plugin to prevent exploitation.