SEP sesam before 5.2.0.24 mishandles User Authorization with MFA. If AD authentication is configured and MFA is enforced, an attacker can create a second OTP access capability. SEP sesam and Active Directory handle username capitalization differently, which may allow multiple SEP sesam user accounts to be created for the same Active Directory (AD) account. Active Directory treats usernames as case-insensitive, while SEP sesam distinguishes between different letter casing. As a result, the same AD user can be represented by multiple SEP sesam user accounts that differ only in username capitalization. When Active Directory authentication is configured and multi-factor authentication (MFA) is enforced, this behavior may allow an additional OTP Authenticator to be registered for the same AD account, reducing the effectiveness of MFA protection.

Project Subscriptions

Vendors Products
Advisories

No advisories yet.

Fixes

Solution

The issue is fixed in latest release versions >= v5.2.0.24. It is strongly recommended to update, if AD authentication is in use.


Workaround

No workaround given by the vendor.

History

Tue, 15 Sep 2026 18:15:00 +0000

Type Values Removed Values Added
Title Case-sensitive Username Handling Enables Duplicate MFA Authenticators in SEP sesam

Tue, 15 Sep 2026 03:00:00 +0000

Type Values Removed Values Added
Title MFA Bypass via Username Case Sensitivity in SEP sesam

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Title MFA Bypass via Username Case Sensitivity in SEP sesam
Metrics ssvc

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


Mon, 14 Sep 2026 06:15:00 +0000

Type Values Removed Values Added
Title Multiple SEP sesam User Accounts via Case Sensitivity Allowing Extra MFA Factor

Sun, 13 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Title Multiple SEP sesam User Accounts via Case Sensitivity Allowing Extra MFA Factor

Sun, 13 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Sep
Sep sesam
Vendors & Products Sep
Sep sesam

Sun, 13 Sep 2026 14:15:00 +0000

Type Values Removed Values Added
Title SEP sesam MFA Bypass via Username Case Handling

Sun, 13 Sep 2026 00:00:00 +0000

Type Values Removed Values Added
Title SEP sesam MFA Bypass via Username Case Handling

Sat, 12 Sep 2026 22:30:00 +0000

Type Values Removed Values Added
Description SEP sesam before 5.2.0.24 mishandles User Authorization with MFA. If AD authentication is configured and MFA is enforced, an attacker can create a second OTP access capability. SEP sesam and Active Directory handle username capitalization differently, which may allow multiple SEP sesam user accounts to be created for the same Active Directory (AD) account. Active Directory treats usernames as case-insensitive, while SEP sesam distinguishes between different letter casing. As a result, the same AD user can be represented by multiple SEP sesam user accounts that differ only in username capitalization. When Active Directory authentication is configured and multi-factor authentication (MFA) is enforced, this behavior may allow an additional OTP Authenticator to be registered for the same AD account, reducing the effectiveness of MFA protection.
Weaknesses CWE-180
References
Metrics cvssV3_1

{'score': 3.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-14T16:22:53.589Z

Reserved: 2026-08-25T06:14:33.619Z

Link: CVE-2026-79300

cve-icon Vulnrichment

Updated: 2026-09-14T16:22:47.936Z

cve-icon NVD

Status : Received

Published: 2026-09-12T23:17:00.893

Modified: 2026-09-14T17:17:51.533

Link: CVE-2026-79300

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T18:00:17Z

Weaknesses