This vulnerability (CVE-2026-65448) is an instance of CWE-79, improper neutralization of input during web page generation, leading to Cross-Site Scripting (XSS) in the Anti Spam and list cleaner – AcyChecker product by AcyMailing Newsletter Team. It affects unauthenticated users and impacts versions up to 1.8.1. The CVSS 3.1 base score is 6.5, reflecting network attack vector, low attack complexity, low privileges required, user interaction required, and impacts on confidentiality, integrity, and availability. No vendor advisory or patch information is currently available, and no known exploits have been reported.

Successful exploitation could allow an unauthenticated attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to partial confidentiality, integrity, and availability impacts. This could result in unauthorized actions or data exposure within the scope of the vulnerable application.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider applying web application firewall (WAF) rules to detect and block suspicious input patterns related to XSS. Monitor vendor channels for updates and apply patches promptly once available.