The WP Post Category Notifications plugin for WordPress, up to version 1.0, contains a reflected cross-site scripting vulnerability due to improper input neutralization during web page generation. This allows an attacker to craft malicious input that is reflected in the web page output without proper sanitization, potentially enabling script execution in users' browsers. The vulnerability is remotely exploitable without privileges and requires user interaction. The CVSS 3.1 base score is 7.1, reflecting high impact 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 session. This may lead to information disclosure, session hijacking, or other malicious actions impacting confidentiality, integrity, and availability of the affected system or user data. However, no active exploits have been reported so far.

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 WP Post Category Notifications plugin if feasible. Additionally, applying web application firewall (WAF) rules that detect and block reflected XSS payloads may provide temporary mitigation.