CVE-2026-58480

CVE-2026-58480 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 1 public exploit from researchers including shinthink.

AI-analyzed exploit summary This PoC exploits CVE-2026-58480, an unauthenticated arbitrary file upload vulnerability in Blocksy Companion Pro < 2.1.47. The exploit bypasses file extension validation via a strpos() substring check in the Custom Fonts extension, allowing PHP code execution via double-extension filenames like shell.woff2.php.

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.