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CVE-2026-27444— Header Email Address Parsing

Quick assessment

Affected
SEPPmail Secure Email Gateway
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于错误解释电子邮件标头中的电子邮件地址，导致与其他邮件基础设施的解释冲突，可能允许攻击者伪造电子邮件来源或解密电子邮件。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.38% · P30
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I. Basic Information for CVE-2026-27444

Vulnerability Information
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Vulnerability Title
Header Email Address Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
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，该漏洞源于错误解释电子邮件标头中的电子邮件地址，导致与其他邮件基础设施的解释冲突，可能允许攻击者伪造电子邮件来源或解密电子邮件。
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-2026-27444

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III. Intelligence Information for CVE-2026-27444

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Other References for CVE-2026-27444 (1)

Same Patch Batch · SEPPmail · 2026-03-04 · 8 CVEs total

CVE-2026-27441 PDF Password CMDi
CVE-2026-27442 zip_attachments Path Traversal
CVE-2026-27443 S/MIME Decryption Tag Sanitization Bypass
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

Same product: Secure Email Gateway
Same vendor: SEPPmail
Same weakness: CWE-436

V. Comments for CVE-2026-27444

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