CVE-2026-84831

Mandatory MFA bypass before enrollment

Published Sep 3, 2026 CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Seppmail
Seppmail seppmail Secure Email Gateway
Vendors & Products Seppmail
Seppmail seppmail Secure Email Gateway
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Mandatory MFA bypass before enrollment
Weaknesses CWE-287
CWE-306
References
Metrics cvssV4_0

{'score': 7.7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
NCSC.ch
Published
Updated
Oct 8, 2026, 11:15 AM
Reserved
Sep 2, 2026, 11:31 AM
Status
Deferred
Published
Sep 3, 2026, 1:06 PM
Modified
Sep 3, 2026, 6:14 PM