CVE-2021-24226: 
WordPress vulnerability analysis and mitigation

CVE-2021-24226 affects the AccessAlly WordPress plugin versions before 3.5.7. The vulnerability involves information exposure through the leakage of environment variables via the $SERVER superglobal in public-facing pages containing the [accessallyorder_form] shortcode (WPScan).

The vulnerability exists in the file 'resource/frontend/product/product-shortcode.php' which handles the [accessallyorderform] shortcode functionality. The issue stems from the code dumping serialize($_SERVER), which exposes all environment variables on pages containing this shortcode. The vulnerability has a CVSS score of 5.3, indicating a medium severity level (Wordfence).

When exploited, this vulnerability leads to the exposure of server environment variables through public-facing pages. No authentication or administrative privileges are required to exploit this vulnerability, making it accessible to any visitor of the affected pages (WPScan).

The vulnerability was fixed in AccessAlly version 3.5.7. Users are advised to upgrade to this version or later to prevent the exposure of server environment variables (WPScan).