CVE-2026-16621: Unknown Payment Gateway For PayPal On Woocommerce

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

The Payment Gateway for PayPal on WooCommerce WordPress plugin before 9.2.1 does not verify that payment actually succeeded before completing an order in its PayPal return handler: it reads attacker-controlled parameters, performs no amount comparison and no order-ownership check, and completes the order even when the server-side gateway verification fails, allowing an unauthenticated attacker to mark arbitrary orders as paid without paying.

Affected products

• Unknown Payment Gateway For PayPal On Woocommerce: before 9.2.1 (fixed in 9.2.1)

Published 2026-08-12. Last modified 2026-08-26.