CVE-2026-29140

| EUVD-2026-18160 HIGH
2026-04-02 NCSC.ch GHSA-mmr3-c33j-h2f2
7.7
CVSS 4.0
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CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
EUVD ID Assigned
Apr 02, 2026 - 08:45 euvd
EUVD-2026-18160
Analysis Generated
Apr 02, 2026 - 08:45 vuln.today
CVE Published
Apr 02, 2026 - 08:27 nvd
HIGH 7.7

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Information Disclosure

Description

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.

Analysis

SEPPmail Secure Email Gateway before version 15.0.3 allows remote attackers to inject malicious certificates into S/MIME signatures, enabling them to substitute attacker-controlled certificates for future encryption communications with victims. An attacker can exploit this by crafting a specially-formed signed email that embeds unauthorized certificates, which the gateway may then use for subsequent encrypted messages to the targeted recipient, resulting in compromise of encryption confidentiality. …

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Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: 0

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CVE-2026-29140 vulnerability details – vuln.today
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