The niksudan WordPress Additional Logins plugin (version <= 1.0.0) suffers from a reflected cross-site scripting vulnerability due to improper input neutralization during web page generation. This allows an attacker to craft malicious URLs that, when visited by a user, execute arbitrary scripts in the user's browser context. The CVSS 3.1 base score is 7.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, scope change, and low impacts on confidentiality, integrity, and availability.

Successful exploitation of this vulnerability can allow an attacker to execute arbitrary scripts in the context of the victim's browser session, potentially leading to theft of sensitive information, session hijacking, or other malicious actions affecting confidentiality, integrity, and availability to a limited extent. The scope change indicates that the vulnerability affects components beyond the initially vulnerable component.

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 mitigate risk. Additionally, applying web application firewall (WAF) rules that detect and block reflected XSS payloads may provide temporary mitigation.