The MemberPress Discord Addon by expresstechsoftware contains a reflected XSS vulnerability due to improper input neutralization during web page generation. This affects all versions up to 1.1.1. The vulnerability allows an attacker to craft malicious input that, when reflected by the web application, executes arbitrary scripts in the victim's browser session. The CVSS v3.1 base score is 7.1, indicating high severity, with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the victim's browser, potentially leading to theft of sensitive information, session hijacking, or other malicious actions affecting confidentiality, integrity, and availability to a limited extent. However, no known active exploits have been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution with untrusted input and consider implementing web application firewall (WAF) rules to detect and block reflected XSS attempts. Monitor vendor channels for updates regarding patches or official mitigations.