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TI-2026-02353 Aliases CVE-2026-2748GHSA-qg5v-hxpj-p53x

S/MIME Certificate Subject Whitespace

Priority LOW 39CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Spoofing
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-295.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00131 2nd percentileScored 2026-11-07
Fix Fixed Secure Email Gateway (SEPPmail): 15.0.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SEPPmailSecure Email Gatewaybefore 15.0.115.0.1Patch availableCNA
  • Secure Email Gateway VendorSEPPmail Affected before 15.0.1 Fixed in 15.0.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:seppmail:seppmail:*:*:*:*:*:*:*:*before 15.0.1VulnerableSEPPmail
  • cpe:2.3:a:seppmail:seppmail:*:*:*:*:*:*:*:* Versions before 15.0.1 Vulnerable ·SEPPmail

Remediation

  • Fix · CNA Secure Email Gateway (SEPPmail) Fixed in 15.0.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    SEPPmail Secure Email Gateway 15.0.1

    8 records Highest priority Priority MEDIUM 4 MEDIUM, 4 LOW

    Other records, highest priority first

    Show all 8 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-2748
  2. 2026-10-03 Alias added: GHSA-qg5v-hxpj-p53x

References

Advisory 1

  • TI-2026-02349 SEPPmail User Web Interface Arbitrary File Write to RCE CVSS 4.0CRITICAL 10.0
  • TI-2021-11768 SEPPMail's web frontend, user input is not embedded correctly in the web page and… CVSS 3.1MEDIUM 6.1
  • TI-2021-11767 The SEPPmail solution is vulnerable to a Cross-Site Scripting vulnerability (XSS)… CVSS 3.1MEDIUM 6.1
  • TI-2026-21852 PDF Password CMDi CVSS 4.0CRITICAL 9.5
  • TI-2026-21853 zip_attachments Path Traversal CVSS 4.0CRITICAL 9.3
  • TI-2026-21854 S/MIME Decryption Tag Sanitization Bypass CVSS 4.0HIGH 8.2
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences