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CVE Vulnerability Details :
CVE-2026-29143
PUBLISHED
More InfoOfficial Page
Assigner-NCSC.ch
Assigner Org ID-455daabc-a392-441d-aa46-37d35189897c
View Known Exploited Vulnerability (KEV) details
Published At-02 Apr, 2026 | 08:49
Updated At-02 Apr, 2026 | 13:34
Rejected At-
▼CVE Numbering Authority (CNA)
S/MIME Decryption Impersonation

SEPPmail Secure Email Gateway before version 15.0.3 does not properly authenticate the inner message of S/MIME-encrypted MIME entities, allowing an attacker to control trusted headers.

Affected Products
Vendor
SEPPmail
Product
Secure Email Gateway
Default Status
unaffected
Versions
Affected
  • From 0 before 15.0.3 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-20CWE-20 Improper Input Validation
Type: CWE
CWE ID: CWE-20
Description: CWE-20 Improper Input Validation
Metrics
VersionBase scoreBase severityVector
4.07.8HIGH
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
Version: 4.0
Base score: 7.8
Base severity: HIGH
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-43CAPEC-43 Exploiting Multiple Input Interpretation Layers
CAPEC-194CAPEC-194 Fake the Source of Data
CAPEC ID: CAPEC-43
Description: CAPEC-43 Exploiting Multiple Input Interpretation Layers
CAPEC ID: CAPEC-194
Description: CAPEC-194 Fake the Source of Data
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Andris Suter-Dörig
coordinator
Matteo Scarlata
coordinator
Kenny Paterson
Timeline
EventDate
Vulnerability disclosed to SEPPmail2025-10-31 14:22:00
Version 15.0.3 released2026-03-03 00:00:00
Event: Vulnerability disclosed to SEPPmail
Date: 2025-10-31 14:22:00
Event: Version 15.0.3 released
Date: 2026-03-03 00:00:00
Replaced By
Rejected Reason
References
HyperlinkResource
https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503
release-notes
Hyperlink: https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503
Resource:
release-notes
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found