CVE-2026-27443
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
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| seppmail | seppmail | to 15.0.1 (exc) |
Helpful Resources
Exploitability
| 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
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know