CVE-2026-27443
Received Received - Intake
Header Injection Vulnerability in SEPPmail Secure Email Gateway

Publication date: 2026-03-04

Last updated on: 2026-03-05

Assigner: Switzerland Government Common Vulnerability Program

Description
SEPPmail Secure Email Gateway before version 15.0.1 does not properly sanitize the headers from S/MIME protected MIME entities, allowing an attacker to control trusted headers.
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Meta Information
Published
2026-03-04
Last Modified
2026-03-05
Generated
2026-06-16
AI Q&A
2026-03-04
EPSS Evaluated
2026-06-15
NVD
CVE-2026-27443
EUVD
EUVD-2026-9379
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
seppmail seppmail to 15.0.1 (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 exists in SEPPmail Secure Email Gateway versions before 15.0.1. It occurs because the software does not properly sanitize the headers from S/MIME protected MIME entities. As a result, an attacker can manipulate these trusted headers.

Impact Analysis

An attacker exploiting this vulnerability can control trusted email headers, which may lead to unauthorized actions or bypass of security controls that rely on these headers. This could result in email spoofing, phishing, or other malicious activities that compromise the integrity and trustworthiness of email communications.

Compliance Impact

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