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

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact High

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00023.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Seppmail
  • Seppmail Secure Email Gateway

No data.

No data.

No data.

References
Link Providers
https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure cve-icon cve-icon
History

Wed, 04 Mar 2026 09:15:00 +0000

Type Values Removed Values Added
Description SEPPmail Secure Email Gateway before version 15.0.1 improperly validates S/MIME certificates issued for email addresses containing whitespaces, allowing signature spoofing.
Title S/MIME Certificate Subject Whitespace
First Time appeared Seppmail
Seppmail seppmail Secure Email Gateway
Weaknesses CWE-295
CPEs cpe:2.3:a:seppmail:seppmail_secure_email_gateway:*:*:*:*:*:*:*:*
Vendors & Products Seppmail
Seppmail seppmail Secure Email Gateway
References
Metrics cvssV4_0

{'score': 7.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: NCSC.ch

Published:

Updated: 2026-03-04T08:48:58.786Z

Reserved: 2026-02-19T13:56:33.534Z

Link: CVE-2026-2748

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-04T09:15:58.290

Modified: 2026-03-04T09:15:58.290

Link: CVE-2026-2748

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.