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I. Basic Information for CVE-2026-29140
Vulnerability Information

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Vulnerability Title
S/MIME Signature Additional Certificate
Source: NVD (National Vulnerability Database)
Vulnerability Description
SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to cause attacker-controlled certificates to be used for future encryption to a victim by adding the certificates to S/MIME signatures.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
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,该漏洞源于允许攻击者将证书添加到S/MIME签名中,导致未来对受害者的加密使用攻击者控制的证书。
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
VendorProductAffected VersionsCPESubscribe
SEPPmailSecure Email Gateway 0 ~ 15.0.3 -
II. Public POCs for CVE-2026-29140
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III. Intelligence Information for CVE-2026-29140
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IV. Related Vulnerabilities
V. Comments for CVE-2026-29140

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