CVE-2026-29143— S/MIME Decryption Impersonation
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I. Basic Information for CVE-2026-29143
Vulnerability Information
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Vulnerability Title
S/MIME Decryption Impersonation
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
SEPPmail Secure Email Gateway 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SEPPmail Secure Email Gateway是德国SEPPmail公司的一个电子邮件安全网关。 SEPPmail Secure Email Gateway 15.0.3之前版本存在安全漏洞，该漏洞源于未正确验证S/MIME加密MIME实体的内部消息，允许攻击者控制受信任的标头。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| SEPPmail | Secure Email Gateway | 0 ~ 15.0.3 | - |
II. Public POCs for CVE-2026-29143
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · SEPPmail · 2026-04-02 · 14 CVEs total
| CVE-2026-29140 | S/MIME Signature Additional Certificate | |
| CVE-2026-29135 | Webmail Password Tag Sanitization Bypass | |
| CVE-2026-29132 | ESWmail-Verify Bypass | |
| CVE-2026-29133 | UID Regex Bypass | |
| CVE-2026-29134 | GINA Domain Switch | |
| CVE-2026-29144 | Unicode Subject Tags | |
| CVE-2026-29141 | Bounded Subject Tag Sanitization | |
| CVE-2026-29137 | Long Subject Untagging | |
| CVE-2026-29142 | Plaintext secure-mail.html | |
| CVE-2026-29138 | PGP Decryption Sender LDAP Injection | |
| CVE-2026-29139 | GINA State Confusion Account Takeover | |
| CVE-2026-29136 | CA Notification HTML Injection | |
| CVE-2026-29131 | PGP Decryption Recipient LDAP Injection |
IV. Related Vulnerabilities
V. Comments for CVE-2026-29143
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