Auth bypass in Red Hat Build Of Keycloak
CVE-2026-9799
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.4 — versions 26.4.13-1, 26.4-19
- Red Hat Build Of Keycloak 26.4.13
- Red Hat Build Of Keycloak 26.6 — versions 26.6.4-2, 26.6-8
- Red Hat Build Of Keycloak 26.6.4
- Red Hat Build Of Keycloak
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-9799 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:30083 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:30084 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:30049 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:30050 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-9799?
- CVE-2026-9799 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.6/10. Published 2026-06-25.
- How severe is CVE-2026-9799?
- Medium severity. CVSS v3 base score is 4.6 out of 10.