What’s Vulnerable › Vulnerabilities
CVE-2026-2748: S/MIME Certificate Subject Whitespace
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-04 · updated 2026-06-17
- Weakness: CWE-295
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 products
- SEPPmail: before 15.0.1 — fixed in 15.0.1
How to fix
Upgrade to a fixed version: SEPPmail 15.0.1. Check the vendor advisory for mitigations.
References
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