Payment Gateway Flaw in WooCommerce Plugin by WordPress
CVE-2026-16621

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
Payment Gateway For Paypal On WooCommerce
Vendor
CVE Published:
12 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16621?

The Payment Gateway for PayPal in the WooCommerce plugin prior to version 9.2.1 contains a vulnerability that compromises the integrity of payment processing. It fails to validate whether a payment was successfully completed before marking orders as paid. The exploit allows an unauthenticated attacker to manipulate the system by leveraging attacker-controlled parameters. Without proper checks for payment confirmation or ownership of the order, this flaw enables the attacker to mark any order as paid, thereby circumventing actual payment requirements.

Affected Version(s)

Payment Gateway for PayPal on WooCommerce 0 < 9.2.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-16621 - Proof of Concept

References

https://wpscan.com/vulnerability/76c4cff2-1166-45fe-9517-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Muni Nitish Kumar Yaddala
WPScan
.