This vulnerability in the Brecht Custom Related Posts plugin is due to improper neutralization of input during web page generation, leading to stored cross-site scripting (XSS). An attacker with low privileges and requiring user interaction can exploit this to execute arbitrary scripts, potentially impacting confidentiality, integrity, and availability. The affected versions include all up to 1.7.4. The CVSS 3.1 vector indicates network attack vector, low attack complexity, low privileges required, user interaction required, and a scope change with low impact on confidentiality, integrity, and availability.

Successful exploitation can lead to execution of arbitrary scripts in the context of other users, potentially allowing theft of user credentials, session tokens, or performing actions on behalf of the user. The impact is rated medium with limited confidentiality, integrity, and availability impact as per the CVSS vector. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider restricting access to the plugin functionality to trusted users and apply web application firewall (WAF) rules to detect and block XSS payloads related to this plugin. Monitor vendor channels for updates and apply patches promptly once released.