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CVE-2026-84831— Mandatory MFA bypass before enrollment

Quick assessment

Affected
SEPPmail AG SEPPmail Secure Email Gateway (SEG)
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是瑞士SEPPmail公司的一个电子邮件安全网关。 SEPPmail Secure Email Gateway 15.0.7之前版本存在授权问题漏洞，该漏洞源于在完成必需的多因素身份验证注册之前创建了完全特权会话，导致拥有需要MFA但未注册账户密码的攻击者可在不提供第二因素的情况下访问受保护功能。

CVSS 7.7 · High EPSS 0.47% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
SEPPmail AG SEPPmail Secure Email Gateway (SEG) < 15.0.7 affected
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I. Basic Information for CVE-2026-84831

Vulnerability Information
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Vulnerability Title
Mandatory MFA bypass before enrollment
Source: CVE Program / CVE List V5
Vulnerability Description
SEPPmail Secure Email Gateway before 15.0.7 creates a fully privileged session before required multi-factor authentication enrollment is completed. An attacker with the password for an MFA-required but unenrolled account can access protected functionality without providing a second factor.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
SEPPmail Secure Email Gateway 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SEPPmail Secure Email Gateway是瑞士SEPPmail公司的一个电子邮件安全网关。 SEPPmail Secure Email Gateway 15.0.7之前版本存在授权问题漏洞，该漏洞源于在完成必需的多因素身份验证注册之前创建了完全特权会话，导致拥有需要MFA但未注册账户密码的攻击者可在不提供第二因素的情况下访问受保护功能。
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 AG SEPPmail Secure Email Gateway (SEG) 0 ~ 15.0.7 -

II. Public POCs for CVE-2026-84831

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III. Intelligence Information for CVE-2026-84831

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Vendor Pages for CVE-2026-84831 (1)

Same Patch Batch · SEPPmail AG · 2026-09-03 · 3 CVEs total

CVE-2026-84832 8.6 HIGH Unsafe deserialization in the REST interface
CVE-2026-84830 8.6 HIGH OS command injection in privileged configuration handling

IV. Related Vulnerabilities

Same product: SEPPmail Secure Email Gateway (SEG)
Same vendor: SEPPmail AG
Same weakness: CWE-287