HarborGuard / CVE
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HIGHCVE-2026-29143Published Modified CNA NCSC.ch

CVE-2026-29143: S/MIME Decryption Impersonation

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.

Metrics

CVSS v4.0
7.8
Severity
HIGH
Fixed in
15.0.3
Affected Products
1

Fix available

15.0.3
Affected packages
  • SEPPmail / Secure Email Gateway
    < 15.0.3 (from 0)
CVSS 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
References