Email Gateway Vulnerability in SEPPmail Products
CVE-2026-29133

5.3MEDIUM

Key Information:

Vendor

Seppmail

Status
Secure Email Gateway
Vendor
CVE Published:
2 April 2026

What is CVE-2026-29133?

The SEPPmail Secure Email Gateway prior to version 15.0.3 is susceptible to an improper input validation vulnerability that allows attackers to upload PGP keys associated with user IDs (UIDs) that do not correspond with the user's email address. This discrepancy could lead to potential email spoofing or unauthorized access by misusing the upload functionality, posing significant risks to email data integrity and security.

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:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Andris Suter-Dörig
Matteo Scarlata
Kenny Paterson
.