Password Sanitization Flaw in SEPPmail Secure Email Gateway
CVE-2026-29135

5.3MEDIUM

Key Information:

Vendor

Seppmail

Status
Secure Email Gateway
Vendor
CVE Published:
2 April 2026

What is CVE-2026-29135?

A flaw in SEPPmail Secure Email Gateway prior to version 15.0.3 allows attackers to create a specially crafted password tag that can bypass the sanitization checks for email subjects. This vulnerability can potentially enable malicious actors to execute unauthorized actions within the email system, compromising the integrity and security of 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:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Andris Suter-Dörig
Matteo Scarlata
Kenny Paterson
.