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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.

在版本 15.0.7 之前的 SEPPmail Secure Email Gateway 中，系统会在完成所需的多因素认证（MFA）注册之前，就创建一个完全授权的会话。这意味着，攻击者如果拥有某个需要 MFA 但尚未完成注册的账户密码，就可以在不提供第二认证因子的情况下，访问受保护的功能。

CVSS 7.7 · High EPSS 0.45% · P38

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

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

V. Comments for CVE-2026-84831

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