CVE-2026-44126

CRITICAL

SEPPmail Secure Email Gateway - Insecure Deserialization

Title source: manual

Description

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.

References (2)

Core 2

Core References

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

https://labs.infoguard.ch/posts/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128/

Scores

CVSS v4 9.2

EPSS 0.0047

EPSS Percentile 36.9%

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-502

Status published

Products (1)

SEPPmail AG/Secure Email Gateway < 15.0.4

Published May 08, 2026

Tracked Since May 08, 2026