Описание
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.
EPSS
5.4 Medium
CVSS3
Дефекты
Связанные уязвимости
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.
A flaw was found in Keycloak. A significant Broken Access Control vuln ...
Keycloak Affected by Broken Access Control Vulnerability in the UserManagedPermissionService
ALT-PU-2026-4227: package `keycloak` update to version 26.5.5-alt1
ALT-PU-2026-4903: package `keycloak` update to version 26.5.6-alt1
EPSS
5.4 Medium
CVSS3