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CVE-2026-29140

HIGH CVSS 4.0: 7.7 EPSS 0.02%
Updated Apr 16, 2026
Seppmail
Parameter Value
CVSS 7.7 (HIGH)
Affected Versions 0 — 15.0.3
Fixed In 15.0.3
Type CWE-295 (Improper Certificate Validation)
Vendor Seppmail
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption

CVSS Vector v4.0

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Seppmail Seppmail_Secure_Email_Gateway
cpe:2.3:a:seppmail:seppmail_secure_email_gateway:*:*:*:*:*:*:*:*
0 15.0.3
Seppmail Secure_Email_Gateway
cpe:2.3:a:seppmail:secure_email_gateway:*:*:*:*:*:*:*:*
15.0.3