CVE-2026-57423 describes a reflected Cross-site Scripting (XSS) vulnerability in the Kofi Mokome Message Filter for Contact Form 7 plugin. The issue arises from improper neutralization of input during web page generation, which can be exploited to inject malicious scripts. The affected versions include all releases up to and including 1.6.3.8. The vulnerability has a CVSS 3.1 base score of 7.1, with network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability. There is no vendor advisory or patch information available at this time, and no known exploits have been reported.

Successful exploitation of this reflected XSS 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 impacts on confidentiality, integrity, and availability as indicated by the CVSS vector. However, no active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider applying web application firewall (WAF) rules to detect and block reflected XSS attempts or disable the vulnerable plugin if feasible.