A flaw was found in SSSD. When configured with the Entra ID identity provider, input lookup names containing single quotes are not properly escaped… (CVE-2026-104040)
Description
A vulnerability in SSSD occurs when configured with the Entra ID identity provider, where input lookup names containing single quotes are not properly escaped before being included in Microsoft Graph OData queries. This flaw allows a low-privileged local user to submit crafted search requests that alter query filters, potentially leading to information disclosure by retrieving unintended directory objects and causing denial of service through excessive processing and cache population. The issue affects multiple specific versions of SSSD. The CVSS score is 4.4, indicating medium severity.
CVSS v3.1
Score 4.4medium
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=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
The vulnerability in SSSD involves improper escaping of single quotes in input lookup names when using the Entra ID identity provider. This improper sanitization affects Microsoft Graph Open Data Protocol (OData) queries, enabling a low-privileged local user to manipulate query filters. Exploitation can result in information disclosure by retrieving directory objects beyond intended scope and denial of service due to excessive processing and cache growth. The flaw is present in numerous specific SSSD versions as enumerated in the affectedVersions list. No known exploits in the wild have been reported, and the CVSS 3.1 base score is 4.4 (medium).
Potential Impact
A low-privileged local user can exploit this vulnerability to broaden user or group searches beyond intended limits, potentially disclosing sensitive directory information. Additionally, the flaw can cause denial of service by triggering excessive processing and cache population in SSSD. There is no indication of integrity or privilege escalation impacts. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid using untrusted input containing single quotes in lookup names when SSSD is configured with the Entra ID identity provider. Monitor vendor channels for patches addressing this issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-104040
- 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:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac80fcb2cdf04f65639c4b7
Added to database: 10/08/2026, 21:48:59 UTC
Last enriched: 10/08/2026, 22:15:59 UTC
Last updated: 10/09/2026, 05:48:07 UTC
Views: 4
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