CVE-2023-30328: Mailbutler Shimo

Critical severity, CVSS 9.8. EPSS: 1.1% chance of exploitation in the next 30 days.

An issue in the helper tool of Mailbutler GmbH Shimo VPN Client for macOS v5.0.4 allows attackers to bypass authentication via PID re-use.

Affected products

• Mailbutler Shimo: version 5.0.4 only

Published 2023-05-04. Last modified 2026-06-17.