CVE-2026-9799

Keycloak: keycloak: unauthorized access to resources via uma permission ticket bypass

Published Jun 25, 2026 CVSS 3.1 · 4.6 Medium EPSS < 1% KEV · Not listed
Description
A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for those specific resources. This vulnerability requires the resource server to be configured in PERMISSIVE policy enforcement mode and affects typed resources with ownerManagedAccess enabled, where no explicit policy protects the resource type. The primary consequence is unauthorized information disclosure or modification of resources.

Remediation

Vendor Workaround

To mitigate this issue, ensure that the Keycloak client's policy enforcement mode is set to ENFORCING instead of PERMISSIVE. The PERMISSIVE mode is a non-default configuration that enables the vulnerability. Changing this setting will prevent the unauthorized access to resources of the same type. Consult Keycloak documentation for specific instructions on configuring policy enforcement mode for your client. This change may require a restart or reload of the Keycloak service to take effect and could impact existing authorization policies if not carefully managed.

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-w3p3-7cjg-vgfw Keycloak allows unauthorized access to resources via uma permission ticket bypass
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Redhat build Of Keycloak
Vendors & Products Redhat build Of Keycloak
Type Values Removed Values Added
CPEs cpe:/a:redhat:build_keycloak: cpe:/a:redhat:build_keycloak:26.6::el9
References
Type Values Removed Values Added
Description A flaw was found in org.keycloak.authorization. An authenticated user with a granted User-Managed Access (UMA) permission ticket for one resource can exploit this by using a specific permission request prefix to bypass per-resource access control. This allows the user to gain unauthorized access to all resources of that type within the same resource server, even if they do not have a ticket for those specific resources. This vulnerability requires the resource server to be configured in PERMISSIVE policy enforcement mode and affects typed resources with ownerManagedAccess enabled, where no explicit policy protects the resource type. The primary consequence is unauthorized information disclosure or modification of resources.
Title Keycloak: keycloak: unauthorized access to resources via uma permission ticket bypass
First Time appeared Redhat
Redhat build Keycloak
Weaknesses CWE-639
CPEs cpe:/a:redhat:build_keycloak:
Vendors & Products Redhat
Redhat build Keycloak
References
Metrics cvssV3_1

{'score': 4.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Jun 26, 2026, 6:46 AM
Reserved
May 28, 2026, 3:53 AM
Status
Analyzed
Published
Jun 25, 2026, 5:17 PM
Modified
Jul 1, 2026, 6:37 PM