CVE-2026-2748

MEDIUM
2026-03-04 [email protected]
5.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:05 vuln.today
CVE Published
Mar 04, 2026 - 09:15 nvd
MEDIUM 5.3

Tags

Authentication Bypass Seppmail

Description

SEPPmail Secure Email Gateway before version 15.0.1 improperly validates S/MIME certificates issued for email addresses containing whitespaces, allowing signature spoofing.

Analysis

SEPPmail Secure Email Gateway versions before 15.0.1 fail to properly validate S/MIME certificates with whitespace characters in email addresses, enabling attackers to forge digital signatures and impersonate legitimate senders. This integrity bypass affects organizations relying on SEPPmail for secure email validation and could undermine trust in digitally signed communications. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +26
POC: 0

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CVE-2026-2748 vulnerability details – vuln.today
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