HTML Injection in SEPPmail Gateway Notification Emails

Publication date: 2026-04-02

Last updated on: 2026-04-16

Assigner: Switzerland Government Common Vulnerability Program

Description

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to inject HTML into notification emails about new CA certificates.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-02

Last Modified

2026-04-16

Generated

2026-07-06

AI Q&A

2026-04-02

EPSS Evaluated

2026-07-05

NVD

CVE-2026-29136

EUVD

EUVD-2026-18152

Affected Vendors & Products

Vendor	Product	Version / Range
seppmail	secure_email_gateway	to 15.0.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Impact Analysis

The vulnerability could allow an attacker to manipulate the content of notification emails by injecting malicious HTML. This could potentially lead to phishing attacks, misleading information, or other malicious activities targeting users who receive these emails.

Executive Summary

This vulnerability exists in SEPPmail Secure Email Gateway versions before 15.0.3. It allows an attacker to inject HTML code into notification emails that inform recipients about new Certificate Authority (CA) certificates.

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