Email Security Flaw in SEPPmail Secure Email Gateway Reveals Encrypted Messages
CVE-2026-29131

4.9MEDIUM

Key Information:

Vendor

Seppmail

Status
Secure Email Gateway
Vendor
CVE Published:
2 April 2026

What is CVE-2026-29131?

The SEPPmail Secure Email Gateway is susceptible to an email security flaw that permits attackers to exploit specially crafted email addresses. This vulnerability allows unauthorized users to access the content of emails that are intended to be encrypted for other recipients, potentially compromising sensitive communications.

Affected Version(s)

Secure Email Gateway 0 < 15.0.3

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.ht...
release-notes

CVSS V4

Score:
4.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Andris Suter-Dörig
Matteo Scarlata
Kenny Paterson
.