This vulnerability in Feehi CMS v2.1.1 is a stored XSS issue where authenticated users can inject arbitrary web scripts or HTML through the Page Sign parameter. The CVSS 3.1 vector indicates network attack vector, low attack complexity, privileges required, user interaction required, and a scope change. The impact affects confidentiality and integrity to a limited extent, with no availability impact. No patch or official remediation level has been published yet.

Successful exploitation allows an authenticated attacker to execute arbitrary scripts in the context of the victim's browser, potentially leading to session hijacking, defacement, or other client-side impacts. The confidentiality and integrity impacts are limited, and availability is not affected. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to trusted authenticated users and consider additional input validation or sanitization controls on the Page Sign parameter if possible.