CVE-2026-39596

The Blocksy Companion Pro plugin for WordPress before version 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.

The Blocksy Companion Pro plugin version 2.1.46 and earlier contains a critical vulnerability allowing unauthenticated remote code execution (RCE). The vulnerability stems from missing authentication in one of the API endpoints.

Versions of Blocksy Companion Pro up to 2.1.37 have a vulnerability allowing remote code execution (RCE) by unauthorized users.

The Blocksy Companion Pro plugin version 2.1.46 and earlier contains an unauthenticated Insecure Direct Object References (IDOR) vulnerability. This allows an attacker to access resources that should be protected without authentication.

The vulnerability allows remote code execution (RCE) in the Blocksy Companion Pro plugin up to version 2.1.45. An attacker can exploit this flaw to take control of the server.