CVE-2025-11833: 
WordPress vulnerability analysis and mitigation

CVE-2025-11833 is a critical Missing Authorization vulnerability discovered in the Post SMTP WordPress plugin versions up to and including 3.6.0, affecting over 400,000 WordPress sites. The vulnerability was disclosed on October 31, 2025, and received a CVSS score of 9.8 (Critical). This security flaw allows unauthenticated attackers to access sensitive email logs, including password reset links, potentially leading to complete account takeover (SecurityOnline Info).

The vulnerability stems from a failure to properly verify user privileges when accessing the plugin's email logs. The vulnerable function allows unauthenticated users to bypass the standard security model entirely, granting them access to sensitive email data including password reset links. The flaw is characterized by low attack complexity and requires no privileges for exploitation, contributing to its maximum severity CVSS score of 9.8 (SecurityOnline Info).

The vulnerability's impact is severe as it allows attackers to access password reset links sent to administrators, which can be used to instantly bypass password requirements and take complete control of affected WordPress sites. This access could lead to full administrative account takeover, enabling attackers to modify site content, install malicious plugins, and conduct further attacks (SecurityOnline Info).

Site administrators using the Post SMTP plugin must immediately update to version 3.6.1, which patches the vulnerability by implementing proper authorization checks. The update was released on October 29, 2025, and includes fixes for the missing authorization vulnerability along with other security improvements (WordPress Plugin Repository).