CVE-2026-16038

MStore API < 4.21.0 - Unauthenticated Payment Bypass via Multiple Payment Gateways

Published Aug 7, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
The MStore API WordPress plugin before 4.21.0 does not verify the payment with the payment gateway before marking an order as paid on several of its payment-completion endpoints, allowing an unauthenticated attacker to mark an arbitrary order fully paid without paying and obtain goods or services for free.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Mstore
Mstore mstore Api
Wordpress
Wordpress wordpress
Vendors & Products Mstore
Mstore mstore Api
Wordpress
Wordpress wordpress
Type Values Removed Values Added
Weaknesses CWE-862
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-285
CWE-640
Type Values Removed Values Added
Description The MStore API WordPress plugin before 4.21.0 does not verify the payment with the payment gateway before marking an order as paid on several of its payment-completion endpoints, allowing an unauthenticated attacker to mark an arbitrary order fully paid without paying and obtain goods or services for free.
Title MStore API < 4.21.0 - Unauthenticated Payment Bypass via Multiple Payment Gateways
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Aug 7, 2026, 6:06 PM
Reserved
Jul 17, 2026, 9:20 AM
Status
Deferred
Published
Aug 7, 2026, 6:16 AM
Modified
Aug 26, 2026, 4:31 PM