EUVD-2026-44990
GHSA-hp9p-wj8m-c339
Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Network-accessible admin API, delegated admin credentials required (PR:L), read-only group attribute disclosure (C:L), no integrity or availability impact.
Primary rating from Vendor (redhat).
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
A flaw was found in the group search functionality of the Keycloak server's administrative API. When Fine-Grained Admin Permissions (FGAP) v2 is enabled, a delegated administrator can bypass access restrictions to view parent groups they are not authorized to see. By searching for a child group they have permission to view, the system incorrectly returns the full details of the parent group in the response, leading to the disclosure of sensitive group attributes and configuration.
AnalysisAI
Group search in Keycloak's administrative API leaks unauthorized parent group details to delegated administrators when Fine-Grained Admin Permissions v2 (FGAP v2) is enabled. A delegated admin with read access to a child group can trigger the flaw simply by searching for that child group, causing the API response to incorrectly return full attribute and configuration data for parent groups they have no authorization to view. CVSS 4.3 Medium (PR:L, C:L) reflects its limited confidentiality impact and authenticated-only exploitability; no active exploitation or public proof-of-concept has been identified at time of analysis.
Technical ContextAI
Keycloak is Red Hat's enterprise-grade identity and access management platform, implementing OAuth 2.0, OIDC, and SAML. Its administrative REST API exposes group management endpoints used by delegated administrators to manage subsets of the identity hierarchy. Fine-Grained Admin Permissions (FGAP) v2 is an advanced authorization layer that allows scoped delegation of administrative tasks to specific realms, groups, or resources. The root cause is CWE-639 (Authorization Bypass Through User-Controlled Key): the group search endpoint accepts a user-controlled child group identifier as a lookup key and constructs a response that inadvertently includes the parent group's full object - attributes, configuration, membership - without re-evaluating whether the requesting principal holds read authorization on that parent. The flaw is in response-object composition, not in the initial authentication or session layer. Affected products per CPE include Red Hat Build of Keycloak, Red Hat Data Grid 8, Red Hat JBoss Enterprise Application Platform Expansion Pack, and Red Hat Single Sign-On 7.
RemediationAI
Apply the patch or updated package versions published by Red Hat via the advisory at https://access.redhat.com/security/cve/CVE-2026-15945; exact fix versions are not confirmed in currently available data - consult the Red Hat Customer Portal and Bugzilla entry 2501302 for the specific errata package versions once released. As a compensating control, organizations that do not require FGAP v2 functionality should disable it entirely; this eliminates the vulnerable code path without impacting standard Keycloak administration, though it removes granular delegation capabilities. Where FGAP v2 must remain enabled, restrict delegated administrator accounts to the minimum necessary group scope and audit current delegation policies to ensure no delegated admin has both child-group read rights and sensitive parent-group data that would constitute a meaningful breach. Monitor Keycloak admin API audit logs for abnormal group search patterns from delegated admin accounts as a detection measure.
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