---
id: CVE-2026-84831
title: Mandatory MFA bypass before enrollment
summary: >-
  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 prote…
severity: high
cvss: 7.7
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-287
  - CWE-306
vendor: SEPPmail AG
product: SEPPmail Secure Email Gateway (SEG)
affected:
  - seppmail_secure_email_gateway_seg < 15.0.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-03T12:34:12.211918Z'
published: '2026-09-03'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T11:15:21.076Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-84831'
references:
  - url: 'https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html'
tags:
  - cve.org
epss: 0.0047
epssPercentile: 0.38618
ingestedAt: '2026-10-08T11:31:27.692Z'
---

## Overview

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.

## Affected

- `seppmail_secure_email_gateway_seg < 15.0.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.