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Description
A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol Mapper Types" policy, which restricts which types of data mappers a client can use, fails to re-validate the mapper type during a client update if the mapper's configuration remains unchanged. An attacker with client registration privileges can exploit this by first registering an allowed mapper type with a malicious configuration and then swapping it for a restricted, high-privilege mapper type (such as one that hardcodes administrative roles). This allows the attacker to gain full administrative access to the Keycloak realm.
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CVE Modified by Red Hat, Inc.8/05/2026 1:16:42 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:50846
Added
Reference
https://access.redhat.com/errata/RHSA-2026:50847
Added
Reference
https://access.redhat.com/errata/RHSA-2026:50848
Added
Reference
https://access.redhat.com/errata/RHSA-2026:50849
Changed
Affected
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New CVE Received from Red Hat, Inc.8/05/2026 12:16:50 PM
Action
Type
Old Value
New Value
Added
Description
A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol Mapper Types" policy, which restricts which types of data mappers a client can use, fails to re-validate the mapper type during a client update if the mapper's configuration remains unchanged. An attacker with client registration privileges can exploit this by first registering an allowed mapper type with a malicious configuration and then swapping it for a restricted, high-privilege mapper type (such as one that hardcodes administrative roles). This allows the attacker to gain full administrative access to the Keycloak realm.
[{"vendor":"Red Hat","product":"Red Hat Build of Keycloak","defaultStatus":"affected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhbk/keycloak-rhel9","cpes":["cpe:/a:redhat:build_keycloak:"]}]
Quick Info
CVE Dictionary Entry: CVE-2026-15572 NVD
Published Date: 08/05/2026 NVD
Last Modified: 08/05/2026
Source: Red Hat, Inc.
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