CVE-2026-27543: Fluxbuilder Mstore API

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

Unauthenticated Privilege Escalation in MStore API <= 4.20.0 versions.

Affected products

• Fluxbuilder Mstore API: up to and including 4.20.0

Published 2026-08-13. Last modified 2026-08-14.