CVE-2026-27444
Received Received - Intake
Email Header Parsing Flaw in SEPPmail Gateway Enables Spoofing

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 incorrectly interprets email addresses in the email headers, causing an interpretation conflict with other mail infrastructure that allows an attacker to fake the source of the email or decrypt it.
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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-2026-27444
EUVD
EUVD-2026-9380
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-436 Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.
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Executive Summary

This vulnerability exists in SEPPmail Secure Email Gateway versions before 15.0.1. It causes the software to incorrectly interpret email addresses in the email headers. This misinterpretation leads to conflicts with other mail infrastructure components.

As a result, an attacker can exploit this flaw to fake the source of an email or decrypt the email content.

Impact Analysis

The vulnerability can allow an attacker to impersonate the source of an email, potentially leading to phishing or spoofing attacks.

Additionally, the attacker may be able to decrypt emails, compromising the confidentiality of sensitive communications.

Compliance Impact

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