TI-2026-21855 Aliases CVE-2026-27444 GHSA-5wwg-q432-32vv

Header Email Address Parsing

MEDIUM 40CWE-436Published 2026-03-04 · Updated 2026-03-04

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

SEPPmail Secure Email Gateway before version 15.0.1 incorrectly interprets email addresses in the email headers, causing an interpretation conflict with other mail infrastructure that allows an attacker to fake the source of the email or decrypt it.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00247 16th 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

Vendor	Product	Affected versions	Fixed in	Status	Source
SEPPmail	Secure Email Gateway	before 15.0.1	15.0.1	Patch available	CNA

Secure Email Gateway VendorSEPPmail Affected before 15.0.1 Fixed in 15.0.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:seppmail:seppmail::::::::	before 15.0.1	Vulnerable	SEPPmail

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 · 2026-03-04
SEPPmail Secure Email Gateway 15.0.1
8 records Highest priority Priority MEDIUM 4 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2026-21852 PDF Password CMDiPriority MEDIUM 49
- TI-2026-21853 zip_attachments Path TraversalPriority MEDIUM 42
- TI-2026-21854 S/MIME Decryption Tag Sanitization BypassPriority MEDIUM 41
Show all 8 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-27444
2026-10-03 Alias added: GHSA-5wwg-q432-32vv
2026-10-25 Priority changed: MEDIUM → LOW
2026-10-31 Priority changed: LOW → MEDIUM

References

Advisory 1

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

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