CVE-2026-29143 | SEPPmail Secure Email Gateway up to 15.0.2 SMIME Message improper authentication

A vulnerability classified as critical has been found in SEPPmail Secure Email Gateway up to 15.0.2. Impacted is an unknown function of the component SMIME Message Handler. Performing a manipulation results in improper authentication.

This vulnerability was named CVE-2026-29143. The attack may be initiated remotely. There is no available exploit.

It is recommended to upgrade the affected component.