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.

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Fixes

Solution

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Workaround

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History

Thu, 02 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 02 Apr 2026 09:00:00 +0000

Type Values Removed Values Added
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.
Title S/MIME Decryption Impersonation
First Time appeared Seppmail
Seppmail seppmail Secure Email Gateway
Weaknesses CWE-20
CPEs cpe:2.3:a:seppmail:seppmail_secure_email_gateway:*:*:*:*:*:*:*:*
Vendors & Products Seppmail
Seppmail seppmail Secure Email Gateway
References
Metrics cvssV4_0

{'score': 7.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: NCSC.ch

Published:

Updated: 2026-04-02T13:34:31.668Z

Reserved: 2026-03-04T09:08:07.342Z

Link: CVE-2026-29143

cve-icon Vulnrichment

Updated: 2026-04-02T13:34:26.815Z

cve-icon NVD

Status : Received

Published: 2026-04-02T09:16:23.123

Modified: 2026-04-02T09:16:23.123

Link: CVE-2026-29143

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses