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.
Other vulnerabilities in Blocksy Companion Pro
See all- CVE-2026-57624Critical
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.
- CVE-2026-40783Critical
Versions of Blocksy Companion Pro up to 2.1.37 have a vulnerability allowing remote code execution (RCE) by unauthorized users.
- CVE-2026-39596Critical
There is an unauthenticated SQL injection vulnerability in Blocksy Companion Pro versions below 2.1.29.
- CVE-2026-57630Medium
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.
- CVE-2026-57315High
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.
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.