CVE-2026-66457 is an unauthenticated cross-site scripting (XSS) vulnerability in the Events Manager product by @msykes, affecting all versions up to and including 7.4.1. The vulnerability stems from improper neutralization of input during web page generation (CWE-79), which could allow attackers to execute arbitrary scripts in the context of the affected web application. The CVSS 3.1 vector indicates the attack can be performed remotely without privileges, requires user interaction, and impacts confidentiality, integrity, and availability to a limited extent.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the vulnerable web application, potentially leading to limited disclosure of information, modification of data, or disruption of service. Because the vulnerability is unauthenticated and remotely exploitable, it poses a significant risk to affected systems. However, 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 released, users should consider applying web application firewalls or input validation controls to mitigate potential exploitation. Monitor vendor channels for updates and apply patches promptly once available.