The Marcel Pol Elo Rating Shortcode plugin for WordPress versions up to 1.0.3 contains a stored cross-site scripting vulnerability due to improper input sanitization during web page generation. This flaw allows an attacker with at least low privileges and requiring user interaction to inject malicious scripts that can execute in the context of other users, potentially leading to partial confidentiality, integrity, and availability impacts. The CVSS vector indicates network attack vector, low attack complexity, low privileges required, user interaction required, and scope change with low impact on confidentiality, integrity, and availability.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the browsers of users who view the affected content, potentially leading to information disclosure, modification of displayed content, or disruption of availability. The impact is rated medium based on the CVSS score of 6.5. 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, users should consider disabling or removing the affected plugin to prevent exploitation. Monitor vendor channels for updates and apply any official patches promptly once available.