What is the CVSS score of CVE-2026-2748?

CVE-2026-2748 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Seppmail are affected by CVE-2026-2748?

CVE-2026-2748 presents moderate security risk rated CVSS 5.3. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-2748?

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

Seppmail CVE-2026-2748

MEDIUM

Improper Certificate Validation (CWE-295)

2026-03-04 vulnerability@ncsc.ch

Authentication Bypass Seppmail

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

CVE Published

Mar 04, 2026 - 09:15 nvd

MEDIUM 5.3

DescriptionCVE.org

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

AnalysisAI

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. No patch is currently available for affected installations.

Technical ContextAI

Classified as CWE-295 (Improper Certificate Validation). Affects Seppmail. SEPPmail Secure Email Gateway before version 15.0.1 improperly validates S/MIME certificates issued for email addresses containing whitespaces, allowing signature spoofing.