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Critical severity9.1NVD Advisory· Published Apr 2, 2026· Updated Apr 16, 2026

CVE-2026-29143

CVE-2026-29143

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

2
  • Seppmail/Secure Email Gateway2 versions
    cpe:2.3:a:seppmail:secure_email_gateway:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:seppmail:secure_email_gateway:*:*:*:*:*:*:*:*range: <15.0.3
    • (no CPE)range: <15.0.3

Patches

Vulnerability mechanics

References

1

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