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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Red Hat Red Hat build of Keycloak 26.4 affected
Version Status Constraints
26.4-22 unaffected < *
Red Hat Red Hat build of Keycloak 26.4 affected
Version Status Constraints
26.4-22 unaffected < *
Red Hat Red Hat build of Keycloak 26.4 affected
Version Status Constraints
26.4.14-1 unaffected < *
Red Hat Red Hat build of Keycloak 26.4.14 unaffected —
Red Hat Red Hat build of Keycloak 26.6 affected
Version Status Constraints
26.6-11 unaffected < *
Red Hat Red Hat build of Keycloak 26.6 affected
Version Status Constraints
26.6-11 unaffected < *
Red Hat Red Hat build of Keycloak 26.6 affected
Version Status Constraints
26.6.5-1 unaffected < *
Red Hat Red Hat build of Keycloak 26.6.5 unaffected —

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://access.redhat.com/security/cve/CVE-2026-15572 cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2499592 cve-icon
History

Wed, 05 Aug 2026 15:30:00 +0000

Type Values Removed Values 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.
Title Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
First Time appeared Redhat
Redhat build Keycloak
Weaknesses CWE-843
CPEs cpe:/a:redhat:build_keycloak:
Vendors & Products Redhat
Redhat build Keycloak
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-05T16:21:46.528Z

Reserved: 2026-07-13T07:36:49.779Z

Link: CVE-2026-15572

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-05T16:30:12Z

Weaknesses