CVE-2026-16621 — MEDIUM (5.3)

Vulnerability 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.

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

LOW

Availability

NONE

References

https://wpscan.com/vulnerability/76c4cff2-1166-45fe-9517-5eda2d24c35d/

FAQ

What is CVE-2026-16621?

CVE-2026-16621 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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-c...

How severe is CVE-2026-16621?

CVE-2026-16621 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-16621?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.