Attachment Filename Validation Issue in SEPPmail Secure Email Gateway by SEPPmail
CVE-2026-27442

9.3CRITICAL

Key Information:

Vendor

Seppmail

Status
Secure Email Gateway
Vendor
CVE Published:
4 March 2026

What is CVE-2026-27442?

The GINA web interface in SEPPmail Secure Email Gateway is prone to an improper input validation flaw that affects attachment filenames in GINA-encrypted emails. This oversight allows attackers to exploit the system and potentially gain unauthorized access to files residing on the gateway. Affected users are at risk until the software is updated to version 15.0.1 or later, where this issue has been rectified.

Affected Version(s)

Secure Email Gateway 0 < 15.0.1

References

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

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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
.