Medium [CVE-2026-104040] Sssd: sssd: information disclosure via odata injection in entra id lookups
This medium-severity Red Hat Linux advisory covers CVE-2026-104040 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
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. Red Hat severity: Moderate — CVSS 4.4 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L).
Weakness: CWE-140.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 40 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 40 minutes ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 40 minutes ago·verify at source
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