CVE-2026-58480
CriticalCVSS 9.8Summary
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.
Risk Assessment
The risk for the organization includes full compromise of the WordPress server, data theft, content modification, and use of the server for further attacks, as an attacker can achieve remote code execution without authentication.
Recommendation
Immediately update the Blocksy Companion Pro plugin to version 2.1.47 or later, and check the server for suspicious double-extension files in upload directories.
Original NVD description (English source)
Blocksy Companion Pro plugin for WordPress before 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.