CVE-2026-36669

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

An unauthenticated arbitrary file upload vulnerability in ck_upload_handler.php in Feng Office 3.11.13.11 allows remote attackers to upload malicious files (such as .html) to the web-accessible /tmp/ directory.

Published 2026-07-17. Last modified 2026-07-23.