This vulnerability (CVE-2026-65439) is an improper neutralization of input during web page generation (CWE-79) in the Ultimate Addons for Contact Form 7 plugin by Themefic. It allows unauthenticated attackers to perform Cross-Site Scripting (XSS) attacks on affected versions (<=3.5.45). The CVSS 3.1 base score is 7.1, indicating a high severity with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability with scope changed. No official patch or remediation level has been disclosed as of the publication date.

Successful exploitation can lead to execution of arbitrary scripts in the context of the affected web application, potentially allowing attackers to steal sensitive information, manipulate content, or disrupt service. The vulnerability affects confidentiality, integrity, and availability of the system. Since the vulnerability is exploitable without authentication, it poses a significant risk to users of the affected plugin versions.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider applying temporary mitigations such as disabling or restricting the use of the affected plugin or limiting exposure of the vulnerable functionality. Monitor vendor communications for updates on patches or official mitigations.