CVE-2026-2748

5.3 MEDIUM

Published: March 04, 2026 Modified: March 05, 2026

Description

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

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure

Source: vulnerability@ncsc.ch

Vendor Advisory

1 reference(s) from NVD

Quick Stats

CVSS v3 Score

5.3 / 10.0

EPSS (Exploit Probability)

0.0%

6th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-295

Affected Vendors

seppmail

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