CVE-2026-44126 PUBLISHED

Insecure deserialization

Assigner: NCSC.ch
Reserved: 05.05.2026 Published: 08.05.2026 Updated: 08.05.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	SEPPmail AG
Product	Secure Email Gateway
Versions	Default: unaffected affected from 0 to 15.0.4 (excl.)

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#security

Problem Types

CWE-502 Deserialization of untrusted data CWE

Impacts

CAPEC-586 Object Injection