CVE-2026-25446 is a critical vulnerability affecting the WishList Member X plugin for WordPress versions 3.29.0 and earlier. This issue allows authenticated attackers to upload arbitrary files to the server, potentially leading to remote code execution. The vulnerability stems from insufficient validation of user-submitted files during the subscription process. WordPress sites using the affected plugin versions are at significant risk, as attackers could exploit this to gain unauthorized access and control over the server. The CVSS score of 9.9 reflects the high severity and potential impact of this vulnerability. Organizations and individuals using the WishList Member X plugin should immediately update to a patched version or apply mitigations to prevent exploitation. Until a fix is applied, administrators are advised to restrict access to the plugin's file upload functionality and monitor for suspicious activity. This vulnerability underscores the importance of timely software updates and rigorous input validation in web applications.