CVE-2026-29143 Details
Description
SEPPmail Secure Email Gateway before version 15.0.3 does not properly authenticate the inner message of S/MIME-encrypted MIME entities, allowing an attacker to control trusted headers.
A vulnerability exists in SEPPmail Secure Email Gateway versions prior to 15.0.3, where the inner message of S/MIME-encrypted MIME entities is not properly authenticated. This flaw allows an attacker to manipulate trusted headers. The issue is particularly relevant for users relying on S/MIME encryption, as it could lead to unauthorized control over email headers, potentially facilitating phishing or spoofing attacks.
Users can update to SEPPmail Secure Email Gateway version 15.0.3 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503 | [email protected] | Release Notes |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| seppmail secure email gateway | < 15.0.3 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 16, 2026 | Initial Analysis | [email protected] |
| Apr 2, 2026 | New CVE Received | [email protected] |