CVE-2026-2748

UNKNOWN 0.0

S/MIME Certificate Subject Whitespace

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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

CWE	CWE-295
Vendor	seppmail
Product	secure email gateway
Published	Mar 4, 2026
Last Updated	Mar 4, 2026

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Affected Versions

SEPPmail / Secure Email Gateway

0 < 15.0.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Andris Suter-Dörig Matteo Scarlata Kenny Paterson