CVE-2026-16038

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

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

MStore API

CVSS v3.1 CNA

9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2026-08-07

Proof-of-concept exploits (1)

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

References

• CVE Record
• NVD entry