What’s Vulnerable › Vulnerabilities
CVE-2026-16038: MStore API < 4.21.0 - Unauthenticated Payment Bypass via Multiple Payment Gateways
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-07 · updated 2026-08-26
- Weakness: CWE-862
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.
Affected products
- inspireui MStore API – Create Native Android & iOS Apps On The Cloud: before 4.21.0 — fixed in 4.21.0
How to fix
Upgrade to a fixed version: inspireui MStore API – Create Native Android & iOS Apps On The Cloud 4.21.0. Check the vendor advisory for mitigations.
References
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