CVE-2025-14778
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Broken Access Control in Keycloak UMA API Enables Privilege Escalation

Publication date: 2026-02-09

Last updated on: 2026-02-10

Assigner: Red Hat, Inc.

Description
A flaw was found in Keycloak. A significant Broken Access Control vulnerability exists in the UserManagedPermissionService (UMA Protection API). When updating or deleting a UMA policy associated with multiple resources, the authorization check only verifies the caller's ownership against the first resource in the policy's list. This allows a user (Owner A) who owns one resource (RA) to update a shared policy and modify authorization rules for other resources (e.g., RB) in that same policy, even if those other resources are owned by a different user (Owner B). This constitutes a horizontal privilege escalation.
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Meta Information
Published
2026-02-09
Last Modified
2026-02-10
Generated
2026-06-16
AI Q&A
2026-02-09
EPSS Evaluated
2026-06-15
NVD
CVE-2025-14778
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
keycloak keycloak *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-266 A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.
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Executive Summary

This vulnerability is a Broken Access Control flaw in Keycloak's UserManagedPermissionService (UMA Protection API). When a user tries to update or delete a UMA policy that applies to multiple resources, the system only checks if the user owns the first resource in the policy's list. Because of this, a user who owns one resource can improperly modify authorization rules for other resources in the same policy that belong to different users. This results in horizontal privilege escalation, where a user gains unauthorized access to resources owned by others.

Impact Analysis

This vulnerability can allow a user to escalate their privileges horizontally by modifying access controls on resources they do not own. As a result, unauthorized users could change authorization rules for other users' resources, potentially gaining access to sensitive information or performing unauthorized actions. This undermines the security and integrity of resource access management within the affected system.

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