What is CVE-2026-18233?

CVE-2026-18233 is a medium-severity vulnerability in Mstore API, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-08-29.

How severe is CVE-2026-18233?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Mstore API

CVE-2026-18233

The MStore API WordPress plugin before 4.21.1 does not verify that the order targeted by one of its delivery endpoints belongs to the requester, allowing any authenticated user, including Subscribers, to mark arbitrary orders as completed and paid without any payment being made.

Vulnerability class: Broken Access Control

EPSS: 0.001 (3.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Unknown Mstore Api

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-18233?: CVE-2026-18233 is a medium-severity vulnerability in Mstore API, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-08-29.
How severe is CVE-2026-18233?: Medium severity. CVSS v3 base score is 6.5 out of 10.