Vulnerability · Published Aug 7, 2026 · Assigned by WPScan
CVE-2026-16038MStore API < 4.21.0 - Unauthenticated Payment Bypass via Multiple Payment Gateways
Critical 9.1
In plain English
A critical-severity missing authorization in MStore API from Unknown. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.4%top 63.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | MStore API | 0 – before 4.21.0 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://wpscan.com/vulnerability/6321d247-39c7-43a6-a528-202e1118a5d5/ exploit, vdb-entry, technical-description