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Vulnerability record · CVE-2026-16038 · published 7 August 2026

CVE-2026-16038: Missing authorization vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.42% · top 66.5% CWE-862 · Missing authorization Deferred
9.1CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
26 Aug 2026Last modified by NVD

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-16038), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.