---
id: CVE-2026-104048
title: A flaw was found in SSSD
summary: >-
  A flaw was found in SSSD. In trust-enabled identity management environments,
  SSSD evaluates Host-Based Access Control (HBAC) rules by stripping domain
  qualifiers and comparing only short usernames. An authenticated user in a
  trusted doma…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-1025
vendor: fedoraproject
product: sssd
affected:
  - sssd = 2.12.0
  - openshift_container_platform = 4.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
published: '2026-10-06'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T12:54:42.760'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104048'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-104048'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2478613'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2478613'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-104048.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-104048'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104048'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.00301
epssPercentile: 0.22736
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-07T14:32:33.019028Z'
ingestedAt: '2026-10-06T20:16:42.489Z'
---

## Overview

A flaw was found in SSSD. In trust-enabled identity management environments, SSSD evaluates Host-Based Access Control (HBAC) rules by stripping domain qualifiers and comparing only short usernames. An authenticated user in a trusted domain who shares the same username as an authorized local account can bypass access policies and gain unauthorized access to protected services or hosts.

## Affected

- `sssd = 2.12.0`
- `openshift_container_platform = 4.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-104048.json)