PT-2026-29697 · Seppmail · Secure Email Gateway

Andris Suter-Dörig

+2

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Published

2026-04-02

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Updated

2026-04-02

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CVE-2026-29140

CVSS v4.0

7.7

High

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:N/SA:N
SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to cause attacker-controlled certificates to be used for future encryption to a victim by adding the certificates to S/MIME signatures.

Fix

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

CVE-2026-29140

Affected Products

Secure Email Gateway