Unauthorized Payment Processing Vulnerability in MStore API Plugin for WordPress
CVE-2026-16038

Currently unrated

Key Information:

Vendor

WordPress
Status
Mstore Api
Vendor
CVE Published:
7 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16038?

The MStore API plugin for WordPress prior to version 4.21.0 features a critical flaw where it fails to authenticate payment through the payment gateway before marking orders as paid. This allows an unauthenticated attacker to manipulate payment statuses, enabling them to falsely mark any order as fully paid without completing an actual transaction. Consequently, attackers can acquire products or services without any payment, posing significant risks to businesses and customers relying on the integrity of the payment system.

Affected Version(s)

MStore API 0 < 4.21.0

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-2026-16038 - Proof of Concept

References

https://wpscan.com/vulnerability/6321d247-39c7-43a6-a528-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sai Praneeth Koti
WPScan
.