Vulnerability · Published Jun 25, 2026 · Assigned by redhat
CVE-2026-9799Keycloak: keycloak: unauthorized access to resources via uma permission ticket bypass
Medium 4.6
In plain English
A medium-severity authorization bypass via user-controlled key in Red Hat build of Keycloak 26.4 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.keycloak:keycloak-services | 26.6.4 | GHSA-w3p3-7cjg-vgfw |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | see references |
| Red Hat | Red Hat build of Keycloak 26.4 | see references |
| Red Hat | Red Hat build of Keycloak 26.4 | see references |
| Red Hat | Red Hat build of Keycloak 26.4.13 | see references |
| Red Hat | Red Hat build of Keycloak 26.6 | see references |
| Red Hat | Red Hat build of Keycloak 26.6 | see references |
| Red Hat | Red Hat build of Keycloak 26.6 | see references |
| Red Hat | Red Hat build of Keycloak 26.6.4 | see references |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
References
- RHSA-2026:30049 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:30050 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:30083 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:30084 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-9799 vdb-entry, x_refsource_REDHAT
- RHBZ#2482471 issue-tracking, x_refsource_REDHAT