CVE-2026-27443— S/MIME Decryption Tag Sanitization Bypass
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I. Basic Information for CVE-2026-27443
Vulnerability Information
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Vulnerability Title
S/MIME Decryption Tag Sanitization Bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
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 15.0.1之前版本存在安全漏洞，该漏洞源于未正确清理来自S/MIME受保护MIME实体的标头，可能导致攻击者控制受信任标头。
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 ~ 15.0.1 | - |
II. Public POCs for CVE-2026-27443
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · SEPPmail · 2026-03-04 · 8 CVEs total
| CVE-2026-27441 | PDF Password CMDi | |
| CVE-2026-27444 | Header Email Address Parsing | |
| CVE-2026-27442 | zip_attachments Path Traversal | |
| CVE-2026-27445 | PGP Signature Reflection | |
| CVE-2026-2748 | S/MIME Certificate Subject Whitespace | |
| CVE-2026-2746 | Missing PGP Signature Tag | |
| CVE-2026-2747 | PGP Mixed Plaintext and Encrypted Content |
IV. Related Vulnerabilities
V. Comments for CVE-2026-27443
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