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HIGHCVE-2026-27443Published Modified CNA NCSC.ch

CVE-2026-27443: S/MIME Decryption Tag Sanitization Bypass

SEPPmail Secure Email Gateway before version 15.0.1 does not properly sanitize the headers from S/MIME protected MIME entities, allowing an attacker to control trusted headers.

Metrics

CVSS v4.0
8.2
Severity
HIGH
Fixed in
15.0.1
Affected Products
1

Fix available

15.0.1
Affected packages
  • SEPPmail / Secure Email Gateway
    < 15.0.1 (from 0)
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N
References