HTML Injection Vulnerability in SEPPmail Secure Email Gateway
CVE-2026-29136

5.3MEDIUM

Key Information:

Vendor

Seppmail

Status
Secure Email Gateway
Vendor
CVE Published:
2 April 2026

What is CVE-2026-29136?

An HTML injection vulnerability in SEPPmail Secure Email Gateway versions before 15.0.3 enables attackers to manipulate notification emails related to new CA certificates. This flaw can allow unauthorized content insertion into email communications, posing risks to the integrity of the notifications. Organizations using affected versions should upgrade to version 15.0.3 or later to mitigate this risk.

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
.