Vulnerability Description
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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://patchstack.com/database/wordpress/plugin/blocksy-companion/vulnerability
- https://wordpress.org/plugins/blocksy-companion/
- https://www.vulncheck.com/advisories/blocksy-companion-pro-unauthenticated-file-
- https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/blocksy
FAQ
What is CVE-2026-58480?
CVE-2026-58480 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 validat...
How severe is CVE-2026-58480?
CVE-2026-58480 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-58480?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.