CVE-2021-24171: Vanquish Woocommerce Upload Files

Critical severity, CVSS 9.8. EPSS: 1.9% chance of exploitation in the next 30 days.

The WooCommerce Upload Files WordPress plugin before 59.4 ran a single sanitization pass to remove blocked extensions such as .php. It was possible to bypass this and upload a file with a PHP extension by embedding a "blocked" extension within another "blocked" extension in the "wcuf_file_name" parameter. It was also possible to perform a double extension attack and upload files to a different location via path traversal using the "wcuf_current_upload_session_id" parameter.

Affected products

• Vanquish Woocommerce Upload Files: before 59.4 (fixed in 59.4)

Published 2021-04-05. Last modified 2026-06-17.