CVE-2026-9792
Keycloak: keycloak: security restriction bypass allows unauthorized ropc token acquisition
CVSS Score
6.5
EPSS Score
0.3%
EPSS Percentile
18th
A flaw was found in Keycloak's Client Policies, specifically within the `org.keycloak.protocol.oidc` component. When certain condition providers (client-type, client-roles, client-attributes, client-scopes) are used to enforce security restrictions, the `reject-ropc-grant` executor is silently bypassed. This allows an unauthenticated remote attacker to obtain tokens via a Resource Owner Password Credentials (ROPC) grant, even when a policy is explicitly configured to block it. This bypass can lead to unauthorized access and information disclosure.
| CWE | CWE-280 |
| Vendor | red hat |
| Product | red hat build of keycloak 26.4 |
| Published | May 28, 2026 |
| Last Updated | Jun 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.13
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6.3
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:25097 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:25098 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:30049 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:30050 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-9792 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2482459
Credits
Red Hat would like to thank Evan Hendra (Independent Security Researcher) for reporting this issue.