Subject Sanitization Bypass in SEPPmail Secure 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 craft a password-tag that bypasses subject sanitization.

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-2026-29135

EUVD

EUVD-2026-18150

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-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.

Attack-Flow Graph

Executive Summary

This vulnerability affects SEPPmail Secure Email Gateway versions before 15.0.3. It allows an attacker to create a specially crafted password-tag that bypasses the subject sanitization process.

Impact Analysis

By bypassing subject sanitization, an attacker may be able to manipulate email subjects in a way that could lead to security risks such as phishing, social engineering, or delivery of malicious content that appears legitimate.

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