CVE-2026-16039: Unknown Mstore API

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

The MStore API WordPress plugin before 4.21.0 does not restrict its vendor-orders endpoint to the caller's own orders, allowing any authenticated user, including Subscribers, to read every WooCommerce order in the store together with each customer's personal information.

Affected products

• Unknown Mstore API: before 4.21.0 (fixed in 4.21.0)

Published 2026-08-07. Last modified 2026-08-26.