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LDAP EUVDEUVD-2026-18156

| CVE-2026-29138 MEDIUM
LDAP Injection (CWE-90)
2026-04-02 NCSC.ch GHSA-whc5-mvj9-gjqw
Information Disclosure LDAP Code Injection
6.3
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
6.3 MEDIUM
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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Apr 16, 2026 - 05:29 EUVD
15.0.3
EUVD ID Assigned
Apr 02, 2026 - 09:00 euvd
EUVD-2026-18156
Analysis Generated
Apr 02, 2026 - 09:00 vuln.today
CVE Published
Apr 02, 2026 - 08:47 nvd
MEDIUM 6.3

DescriptionCVE.org

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.

AnalysisAI

SEPPmail Secure Email Gateway before version 15.0.3 allows remote attackers to impersonate other users by claiming their PGP signatures through a specially crafted email address, enabling signature forgery and identity spoofing in encrypted email communications. The vulnerability exploits LDAP injection mechanisms to manipulate signature verification, affecting all versions prior to 15.0.3. No CVSS score is available, and exploitation status remains unconfirmed from provided data.

Technical ContextAI

The vulnerability resides in SEPPmail Secure Email Gateway's email address handling and PGP signature verification mechanisms, likely involving LDAP directory service integration (per CWE-90: LDAP Injection). When processing emails, the gateway fails to properly sanitize user-supplied email address inputs before using them in LDAP queries or signature validation logic. This allows an attacker to craft a malicious email address containing LDAP metacharacters or escape sequences that alter the query context, causing the system to associate or verify PGP signatures belonging to legitimate users with the attacker's identity. The root cause is insufficient input validation (CWE-90 relates to improper neutralization of special LDAP characters), compounded by weak separation of signature ownership from email header data.

RemediationAI

Upgrade SEPPmail Secure Email Gateway to version 15.0.3 or later immediately. The vendor-released patch version 15.0.3 addresses the LDAP injection flaw in email address parsing and signature verification. Organizations unable to upgrade immediately should consider disabling PGP signature verification until patched, or implement additional manual signature validation procedures. Complete remediation details and deployment guidance are available in the vendor's release notes at https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503.

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EUVD-2026-18156 vulnerability details – vuln.today
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