CVE-2026-84831

Mandatory MFA bypass before enrollment

State: Published
Severity: 7.7 High
Published: Sep 3, 2026
Updated: Oct 8, 2026
Reserved: Sep 2, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	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	NCSC.ch

Weaknesses

CWE-287 Improper Authentication
CWE-306 Missing authentication for critical function

Affected Products

Product	Versions
SEPPmail Secure Email Gateway (SEG)SEPPmail AG	before 15.0.7Affected

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html

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