Vulnerability details

CVE-2026-16038

MStore API

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

CVSS 3.1

9.1Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.1Critical	3.1	CISA ADP / Vulnrichment (CISA-ADP)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
—	MStore API	v < 4.21.0	CVEProject cvelistV5 (CNA)

References and advisories

https://wpscan.com/vulnerability/6321d247-39c7-43a6-a528-202e1118a5d5/ exploitvdb-entrytechnical-description

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Details

Published: 2026-08-07
Last updated: 2026-08-07
State: Published
Assigner (CNA): WPScan

Exploit prediction (EPSS)

0.41%

Probability of exploitation in 30 days

36.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-862
Missing Authorization