Medium [CVE-2026-15945] Group hierarchy search discloses hidden parent groups under FGAP v2
This medium-severity Red Hat Linux advisory covers CVE-2026-15945 affecting Red Hat Build of Keycloak, Red Hat Data Grid 8, Red Hat JBoss Enterprise Application Platform Expansion Pack.
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Summary
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
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.
The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires an authenticated attacker with specific delegated administrative permissions and the non-default FGAP v2 feature to be enabled.
Successful exploitation allows an attacker to disclose sensitive metadata and configuration details of parent groups they are otherwise restricted from viewing. The vulnerability's root cause is a failure to apply fine-grained access control filters to parent groups during hierarchical search result construction.
Weakness: CWE-639. Affected Red Hat products: Red Hat Build of Keycloak; Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 4 days 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 · medium-confidence parse· fetched 4 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 4 days ago·verify at source
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