CVE-2026-2748

7.8 highEPSS 0.1%

High (7.8) in seppmail seppmail. EPSS 0.1% chance of exploitation in the next 30 days.

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

Severity

CVSS 4.0

7.8 high

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

CVSS 3.1

5.3 medium

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

EPSS: 0.1% chance of exploitation in the next 30 days; higher than 2% of CVEs (scores of 2026-10-31)
CWE: CWE-295
Published: 2026-03-04
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

seppmail:seppmail

References

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

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