A vulnerability was found in SEPPmail Secure Email Gateway up to 15.0.2 . It has been classified as critical . This affects an unknown function of the component GINA Webdomain Metadata Handler . This manipulation causes reliance on untrusted inputs in a security decision. This vulnerability is registered as CVE-2026-29134 . Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.