Payment Forgery Vulnerability in WP Express Checkout Plugin by WordPress
CVE-2026-83533

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
WP Express Checkout
Vendor
CVE Published:
2 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-83533?

The WP Express Checkout plugin for WordPress versions prior to 2.4.9 is susceptible to a vulnerability that allows unauthorized users to artificially complete orders without making actual payments. This flaw arises due to the plugin's failure to validate whether a payment transaction was genuinely finalized before marking the order as paid, creating a risk of financial loss and fraud.

Affected Version(s)

WP Express Checkout 0 < 2.4.9

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-2026-83533 - Proof of Concept

References

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

Amity Gilmour
WPScan
.