What’s Vulnerable › Vulnerabilities
CVE-2026-16621: Payment Gateway for PayPal on WooCommerce < 9.2.1 - Unauthenticated Payment Bypass via PayPal Advanced Return Handler
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-12 · updated 2026-08-26
Description
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
- Payment Gateway for PayPal on WooCommerce: before 9.2.1 — fixed in 9.2.1
How to fix
Upgrade to a fixed version: Payment Gateway for PayPal on WooCommerce 9.2.1. Check the vendor advisory for mitigations.
References
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