This vulnerability in fesomia FSM Custom Featured Image Caption plugin involves improper neutralization of input during web page generation, leading to a DOM-based Cross-site Scripting (XSS) issue. It affects versions up to 1.25.1. The vulnerability allows an attacker to inject malicious scripts that execute in the victim's browser, potentially leading to session hijacking or other client-side attacks. No CVSS score or vendor remediation information is currently available.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the affected web application, potentially compromising user sessions or performing unauthorized actions on behalf of the user. However, no known exploits have been reported in the wild, and the exact impact depends on the context in which the plugin is used.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider applying input validation or output encoding workarounds if feasible, or temporarily disabling the plugin if the risk is unacceptable.