A flaw was found in SSSD. In trust-enabled identity management environments, SSSD evaluates Host-Based Access Control (HBAC) rules by stripping… (CVE-2026-104048)
Description
A vulnerability in SSSD affects trust-enabled identity management environments where Host-Based Access Control (HBAC) rules are improperly evaluated. The flaw causes SSSD to strip domain qualifiers and compare only short usernames, allowing an authenticated user in a trusted domain with the same username as a local authorized account to bypass access policies and gain unauthorized access to protected services or hosts. This vulnerability has a CVSS score of 8.1, indicating a high impact on confidentiality and integrity but no impact on availability. Multiple specific versions of SSSD are affected.
CVSS v3.1
Score 8.1high
Affected software
pkg:deb/ubuntu/sssd?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/sssd?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/sssd?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/sssd?arch=source&distro=jammypkg:deb/ubuntu/sssd?arch=source&distro=noblepkg:deb/ubuntu/sssd?arch=source&distro=stonkingpkg:deb/ubuntu/sssd?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-104048 describes a security flaw in SSSD where, in trust-enabled identity management environments, the evaluation of Host-Based Access Control (HBAC) rules is flawed. SSSD strips domain qualifiers and compares only short usernames, which allows an authenticated user in a trusted domain who shares the same username as an authorized local account to bypass access policies. This results in unauthorized access to protected services or hosts. The vulnerability affects numerous specific SSSD versions as listed, with a CVSS 3.1 score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N).
Potential Impact
An authenticated user in a trusted domain can bypass HBAC access policies by exploiting the username comparison flaw, gaining unauthorized access to protected services or hosts. The impact affects confidentiality and integrity but does not affect availability. This could lead to unauthorized data access or modification within the affected environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, administrators should carefully review HBAC configurations and consider additional access controls or monitoring to detect potential unauthorized access attempts. Avoid relying solely on short username comparisons in trust-enabled environments.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-104048
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f4f32cdf04f6566575f2
Added to database: 10/17/2026, 22:21:39 UTC
Last enriched: 10/17/2026, 22:41:32 UTC
Last updated: 10/17/2026, 22:41:32 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.