CVE-2026-58480: Blocksy Companion 0 through 2.1.46

Affected technology

Blocksy Companion · 0 through 2.1.46
Creative Themes

Description’s affected range: before 2.1.47

Component: Not specified by the source
Function: exposed

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

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. Vendor/CNA’s CVSS 4.0 assessment (base score 9.2/10) rates confidentiality, integrity and availability impact as high.