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CVE-2026-2748

S/MIME Certificate Subject Whitespace

MEDIUM
5.3
CVSS Score
Published: March 4, 2026 at 08:48 AM UTC
Updated: June 17, 2026 at 10:31 AM UTC
2 products affected across 1 vendorSEPPmailSecure Email Gateway

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SEPPmail· Seppmail
95%
v < 15.0.1
Secure Email Gateway· Seppmail
60%
v < 15.0.1
Affected range stops below 15.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Release NotesVendor Advisory
Source: cverecord
https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-295

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