CVE-2021-36806: Sophos Email Appliance

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

A reflected XSS vulnerability allows an open redirect when the victim clicks a malicious link to an error page on Sophos Email Appliance older than version 4.5.3.4.

Affected products

• Sophos Email Appliance: before 4.5.3.4 (fixed in 4.5.3.4)

Published 2023-11-30. Last modified 2026-06-17.