Privileged session access via incomplete MFA enrollment
Published Sep 3, 2026 · Updated Sep 3, 2026
Authentication bypass in SEPPmail Secure Email Gateway before 15.0.7 allows remote authenticated users to access protected functions. The login flow creates a fully privileged session before mandatory MFA enrollment is completed, so the password-authenticated session is already authorized. Exploitation requires a valid password for an account configured to require MFA but not yet enrolled, and it exposes the protected functions available to that session.
Summary
What happened
Authentication bypass in SEPPmail Secure Email Gateway before 15.0.7 allows remote authenticated users to access protected functions. The login flow creates a fully privileged session before mandatory MFA enrollment is completed, so the password-authenticated session is already authorized. Exploitation requires a valid password for an account configured to require MFA but not yet enrolled, and it exposes the protected functions available to that session.
The record
- CVE
- CVE-2026-84831
- Published
- Sep 3, 2026
- Updated
- Sep 3, 2026
- Vendor
- SEPPmail AG
- Product
- SEPPmail Secure E-Mail Gateway
- Classifications
- CWE-306, CWE-287, CAPEC-115, T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 3, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <15.0.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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