CVE-2026-44126 CRITICAL

CVE-2026-44126: Insecure deserialization

Vendor Seppmail Ag
Product Secure Email Gateway
Weakness CWE-502 · Unsafe deserialization
Published May 8, 2026
Last update May 18, 2026
View on NVD All CVEs

CVSS base score

9.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 8, 2026 CVE published
May 18, 2026 Record updated