WordPress · Blocksy Companion Pro · CVE-2026-58480
**Name of the Vulnerable Software and Affected Versions**
Blocksy Companion Pro plugin for WordPress versions prior to 2.1.47
**Description**
An unauthenticated arbitrary file upload issue exists within the Advanced Reviews feature. The `save attachments()` function fails to properly validate file extensions, specifically due to a flawed `strpos()` substring check in the Custom Fonts extension. An attacker can bypass this validation by using double-extension filenames, such as `shell.woff2.php`, allowing the upload of executable files that the web server processes as PHP, leading to remote code execution.
**Recommendations**
Update Blocksy Companion Pro plugin for WordPress to version 2.1.47 or later.