---
id: CVE-2026-79300
title: SEP sesam before 5.2.0.24 mishandles User Authorization with MFA
summary: >-
  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
  capitalizatio…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N'
cwe:
  - CWE-180
vendor: SEP
product: sesam
affected:
  - sesam >= 1.0 < 5.2.0.24
published: '2026-09-12'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:00:03.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-79300'
references:
  - url: 'https://wiki.sep.de/wiki/index.php/Release_Notes_5.2.0_Artemis#fixed'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00212
epssPercentile: 0.11796
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T16:22:42.518138Z'
ingestedAt: '2026-09-14T15:23:07.477Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.