CVE-2026-44126
Deferred Deferred - Pending Action
SEPPmail Secure Email Gateway Deserialization Flaw Allows RCE

Publication date: 2026-05-08

Last updated on: 2026-05-18

Assigner: Switzerland Government Common Vulnerability Program

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-05-08
Last Modified
2026-05-18
Generated
2026-06-19
AI Q&A
2026-05-08
EPSS Evaluated
2026-06-18
NVD
CVE-2026-44126
EUVD
EUVD-2026-28635
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
seppmail secure_email_gateway to 15.0.4 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability exists in SEPPmail Secure Email Gateway versions before 15.0.4. It involves insecure deserialization of untrusted data, which can be accessed through the new GINA UI. An unauthenticated remote attacker could exploit this by sending a specially crafted serialized object, potentially allowing them to execute arbitrary code on the affected system.

Impact Analysis

The vulnerability can allow unauthenticated remote attackers to execute arbitrary code on the affected SEPPmail Secure Email Gateway system. This could lead to full system compromise, unauthorized access to sensitive email data, disruption of email services, and potential further attacks within the network.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-44126. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart