CVE-2026-2748 | SEPPmail Secure Email Gateway up to 15.0.0 SMIME certificate validation

A vulnerability was found in SEPPmail Secure Email Gateway up to 15.0.0. It has been declared as critical. This issue affects some unknown processing of the component SMIME Handler. Such manipulation leads to improper certificate validation.

This vulnerability is traded as CVE-2026-2748. The attack may be launched remotely. There is no exploit available.

It is recommended to upgrade the affected component.