The Website LLMs.txt plugin for WordPress suffers from a reflected cross-site scripting vulnerability via the 'tab' parameter. The root cause is the use of filter_input() without applying a sanitization filter combined with insufficient output escaping. This allows attackers to inject malicious scripts that execute in the context of an administrator's browser if they interact with a crafted link. The vulnerability affects all versions up to 8.2.6. The CVSS 3.1 base score is 6.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, scope change, and low confidentiality and integrity impact. No patch or official remediation level has been published by the vendor, and no known exploits have been reported.

Successful exploitation can lead to the execution of arbitrary scripts in the context of an administrator's browser session, potentially allowing theft of sensitive information or unauthorized actions performed with administrator privileges. The impact is limited to confidentiality and integrity with no availability impact. Since the attack requires user interaction (administrator clicking a crafted link), the risk is mitigated somewhat by this requirement.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, administrators should avoid clicking on untrusted links that could exploit the 'tab' parameter in the Website LLMs.txt plugin. Implementing web application firewall (WAF) rules to detect and block reflected XSS attempts targeting this parameter may provide temporary mitigation.