CVE-2026-44126: Seppmail AG Secure Email Gateway

Critical severity, CVSS 9.2. EPSS: 0.8% chance of exploitation in the next 30 days.

SEPPmail Secure Email Gateway before version 15.0.4 insecurely deserializes untrusted data, which can be reached from the new GINA UI and may allow unauthenticated remote attackers to execute code via a crafted serialized object.

Affected products

• Seppmail AG Secure Email Gateway: before 15.0.4 (fixed in 15.0.4)

Published 2026-05-08. Last modified 2026-06-17.