CVE-2026-84831
Mandatory MFA bypass before enrollment
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.
INFO
Published Date :
Sept. 3, 2026, 8:43 a.m.
Last Modified :
Sept. 3, 2026, 8:43 a.m.
Remotely Exploit :
Yes !
Source :
NCSC.ch
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 455daabc-a392-441d-aa46-37d35189897c |
Solution
- Update SEPPmail Secure Email Gateway to version 15.0.7 or later.
- Ensure MFA enrollment is completed before session creation.
- Review account access policies for compliance.
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CVE-2026-84831 vulnerability anywhere in the article.