CVE-2026-104040

A flaw was found in SSSD. When configured with the Entra ID identity provider, input lookup names containing single quotes are not properly escaped before being included in Microsoft Graph Open Data Protocol (OData) queries. A low-privileged local user can exploit this flaw by submitting a crafted search request, altering query filters to broaden user or group searches. This can lead to information disclosure by retrieving unintended directory objects, as well as a Denial of Service (DoS) through excessive processing and cache population.

This vulnerability is rated as Moderate because exploitation requires local access and non-standard domain configuration using the Entra ID identity provider (idp_type = entra_id). In standard Red Hat Enterprise Linux deployments, SSSD does not enable this identity provider by default. An authenticated local attacker can manipulate account lookups to alter query filters, potentially exposing directory metadata or causing resource exhaustion from processing oversized responses. However, data exposure is restricted to the read permissions already granted to the Microsoft Graph client, and the flaw does not permit unauthorized directory modifications or local privilege escalation.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.