CVE-2026-16030: Unknown Mstore API

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

The MStore API WordPress plugin before 4.21.0 does not correctly verify the cryptographic signature of the token used to authenticate its phone-based login, allowing unauthenticated attackers who know a registered user's phone number to forge a token and take over that user's account, including administrator accounts.

Affected products

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

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