CVE-2026-83533 PUBLISHED

WP Express Checkout < 2.4.9 - Unauthenticated Payment Bypass via wpec_process_payment

Assigner: WPScan
Reserved: 31.08.2026 Published: 02.09.2026 Updated: 02.09.2026

The WP Express Checkout WordPress plugin before 2.4.9 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS Score: 5.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Unknown
Product	WP Express Checkout
Versions	Default: unaffected affected from 0 to 2.4.9 (excl.)

Credits

Amity Gilmour finder
WPScan coordinator

References

https://wpscan.com/vulnerability/8ffb76d6-fda5-4819-ab07-d8c086169110/

Problem Types

CWE-345 Insufficient Verification of Data Authenticity CWE