CVE-2026-81764: Acato Email Essentials

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Unauthenticated Cross Site Scripting (XSS) in Email Essentials <= 6.0.6 versions.

Affected products

• Acato Email Essentials: up to and including 6.0.6

Published 2026-08-31. Last modified 2026-09-01.