A flaw was found in the User-Managed Access (UMA) implementation of Keycloak. The issue occurs in the authorization token endpoint when processing permission tickets. If two different users own resources with the same name, the system incorrectly merges the permissions from both resources when one user requests an authorization token. This allows an attacker to gain access scopes on a victim's resource that were never intended to be shared.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

History

Mon, 21 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 21 Sep 2026 07:15:00 +0000

Type Values Removed Values Added
Description A flaw was found in the User-Managed Access (UMA) implementation of Keycloak. The issue occurs in the authorization token endpoint when processing permission tickets. If two different users own resources with the same name, the system incorrectly merges the permissions from both resources when one user requests an authorization token. This allows an attacker to gain access scopes on a victim's resource that were never intended to be shared.
Title Keycloak-services: keycloak-services: uma scope merge across resource owners via resource name collision
First Time appeared Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
Weaknesses CWE-862
CPEs cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 3.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-21T06:45:27.795Z

Reserved: 2026-09-21T05:57:24.902Z

Link: CVE-2026-94217

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-21T07:16:54.430

Modified: 2026-09-21T07:16:54.430

Link: CVE-2026-94217

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-19T23:39:17Z

Links: CVE-2026-94217 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-21T08:30:13Z

Weaknesses