Logo
-

Byte Open Security

(ByteOS Network)

Log In

Sign Up

ByteOS

Security
Vulnerability Details
Registries
Custom Views
Weaknesses
Attack Patterns
Filters & Tools
Vulnerability Details :

CVE-2026-29138

Summary
Assigner-NCSC.ch
Assigner Org ID-455daabc-a392-441d-aa46-37d35189897c
Published At-02 Apr, 2026 | 08:47
Updated At-02 Apr, 2026 | 14:32
Rejected At-
Credits

PGP Decryption Sender LDAP Injection

SEPPmail Secure Email Gateway before version 15.0.3 allows attackers with a specially crafted email address to claim another user's PGP signature as their own.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:NCSC.ch
Assigner Org ID:455daabc-a392-441d-aa46-37d35189897c
Published At:02 Apr, 2026 | 08:47
Updated At:02 Apr, 2026 | 14:32
Rejected At:
▼CVE Numbering Authority (CNA)
PGP Decryption Sender LDAP Injection

SEPPmail Secure Email Gateway before version 15.0.3 allows attackers with a specially crafted email address to claim another user's PGP signature as their own.

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-90CWE-90 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Type: CWE
CWE ID: CWE-90
Description: CWE-90 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Metrics
VersionBase scoreBase severityVector
4.06.3MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-136CAPEC-136 LDAP Injection
CAPEC-194CAPEC-194 Fake the Source of Data
CAPEC ID: CAPEC-136
Description: CAPEC-136 LDAP Injection
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
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:vulnerability@ncsc.ch
Published At:02 Apr, 2026 | 09:16
Updated At:16 Apr, 2026 | 19:01

SEPPmail Secure Email Gateway before version 15.0.3 allows attackers with a specially crafted email address to claim another user's PGP signature as their own.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.3MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Type: Secondary
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CPE Matches
seppmail
seppmail
>>secure_email_gateway>>Versions before 15.0.3(exclusive)
cpe:2.3:a:seppmail:secure_email_gateway:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-90Secondaryvulnerability@ncsc.ch
CWE ID: CWE-90
Type: Secondary
Source: vulnerability@ncsc.ch
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503vulnerability@ncsc.ch
Release Notes
Hyperlink: https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503
Source: vulnerability@ncsc.ch
Resource:
Release Notes

Change History

0
Information is not available yet

Similar CVEs

4Records found
CVE-2026-29134
Matching Score-8
Assigner-Switzerland National Cyber Security Centre (NCSC)
ShareView Details
Matching Score-8
Assigner-Switzerland National Cyber Security Centre (NCSC)
CVSS Score-5.3||MEDIUM
EPSS-0.06% / 17.54%
||
7 Day CHG-0.03%
Published-02 Apr, 2026 | 08:29
Updated-16 Apr, 2026 | 19:03
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
GINA Domain Switch

SEPPmail Secure Email Gateway before version 15.0.3 allows an external user to modify GINA webdomain metadata and bypass per-domain restrictions.

Action-Not Available
Vendor-seppmailSEPPmail
Product-secure_email_gatewaySecure Email Gateway
CWE ID-CWE-807
Reliance on Untrusted Inputs in a Security Decision
CVE-2026-27444
Matching Score-8
Assigner-Switzerland National Cyber Security Centre (NCSC)
ShareView Details
Matching Score-8
Assigner-Switzerland National Cyber Security Centre (NCSC)
CVSS Score-7.8||HIGH
EPSS-0.04% / 13.19%
||
7 Day CHG~0.00%
Published-04 Mar, 2026 | 08:47
Updated-05 Mar, 2026 | 15:34
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Header Email Address Parsing

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.

Action-Not Available
Vendor-seppmailSEPPmail
Product-seppmailSecure Email Gateway
CWE ID-CWE-436
Interpretation Conflict
CVE-2026-27443
Matching Score-8
Assigner-Switzerland National Cyber Security Centre (NCSC)
ShareView Details
Matching Score-8
Assigner-Switzerland National Cyber Security Centre (NCSC)
CVSS Score-8.2||HIGH
EPSS-0.11% / 28.75%
||
7 Day CHG~0.00%
Published-04 Mar, 2026 | 08:45
Updated-05 Mar, 2026 | 15:41
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
S/MIME Decryption Tag Sanitization Bypass

SEPPmail Secure Email Gateway before version 15.0.1 does not properly sanitize the headers from S/MIME protected MIME entities, allowing an attacker to control trusted headers.

Action-Not Available
Vendor-seppmailSEPPmail
Product-seppmailSecure Email Gateway
CWE ID-CWE-20
Improper Input Validation
CVE-2026-29131
Matching Score-6
Assigner-Switzerland National Cyber Security Centre (NCSC)
ShareView Details
Matching Score-6
Assigner-Switzerland National Cyber Security Centre (NCSC)
CVSS Score-4.9||MEDIUM
EPSS-0.04% / 10.58%
||
7 Day CHG-0.02%
Published-02 Apr, 2026 | 08:46
Updated-16 Apr, 2026 | 19:07
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
PGP Decryption Recipient LDAP Injection

SEPPmail Secure Email Gateway before version 15.0.3 allows attackers with a specially crafted email address to read the contents of emails encrypted for other users.

Action-Not Available
Vendor-seppmailSEPPmail
Product-secure_email_gatewaySecure Email Gateway
CWE ID-CWE-90
Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Details not found