Improper input validation in Seppmail Secure Email Gateway

CVE-2026-29143

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (18.6th percentile) — read the EPSS interpretation.

Affected products

Seppmail Secure Email Gateway — versions 0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

downloads.seppmail.com/extrelnotes/150/ERN15.0.html (release-notes)