CVE-2026-29144
Received Received - Intake
Unicode Spoofing Bypass in SEPPmail Email Gateway

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 bypass subject sanitization and forge security tags using Unicode lookalike characters.
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Meta Information
Published
2026-04-02
Last Modified
2026-04-16
Generated
2026-06-16
AI Q&A
2026-04-02
EPSS Evaluated
2026-06-15
NVD
CVE-2026-29144
EUVD
EUVD-2026-18168
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
seppmail secure_email_gateway to 15.0.3 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
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Executive Summary

This vulnerability affects SEPPmail Secure Email Gateway versions before 15.0.3. It allows an attacker to bypass the sanitization process of email subjects by using Unicode lookalike characters. This means the attacker can forge security tags in the email subject line that appear legitimate but are actually manipulated.

Impact Analysis

The impact of this vulnerability is that an attacker can manipulate email subjects to forge security tags, potentially misleading recipients or security systems about the nature or trustworthiness of the email. This could lead to security breaches such as phishing, spoofing, or bypassing email security policies.

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