Payment Processing Flaw in MStore API Plugin for WordPress
CVE-2026-18234

6.5MEDIUM

Key Information:

Vendor

WordPress
Status
Mstore Api
Vendor
CVE Published:
29 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18234?

The MStore API plugin for WordPress prior to version 4.21.1 contains a significant vulnerability in its payment handling mechanism. It fails to verify the ownership of the orders being processed, allowing any authenticated user, including those with minimal roles such as Subscribers, to manipulate order statuses without completing the necessary payment. This oversight can lead to unauthorized marking of orders as paid, severely affecting the integrity of the payment system and the financial balance for businesses relying on this plugin.

Affected Version(s)

MStore API 0 < 4.21.1

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-2026-18234 - Proof of Concept

References

https://wpscan.com/vulnerability/1dc31c4e-9687-4056-a93e-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Erwan LR (WPScan)
WPScan
.