CVE-2026-9792
Description
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.
Statement
This Medium severity flaw in Keycloak allows client policies designed to reject Resource Owner Password Credentials (ROPC) grants to be bypassed. When specific condition providers (client-type, client-roles, client-attributes, or client-scopes) are used, clients can obtain tokens via ROPC despite explicit policy configuration to block such requests. This impacts Keycloak deployments where administrators rely on these policies to enforce FAPI 2.0 compliance and prevent credential exposure.
Mitigation
To mitigate this issue, Keycloak administrators should review and adjust client policies designed to reject Resource Owner Password Credentials (ROPC) grants. Avoid using the `client-type`, `client-roles`, `client-attributes`, or `client-scopes` condition providers in conjunction with the `reject-ropc-grant` executor. Instead, configure policies to use the `grant-type` condition provider for ROPC rejection. A restart or reload of the Keycloak service may be required for these policy changes to take full effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 6.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Understanding the Weakness (CWE)
Other
Technical Impact: Other; Alter Execution Logic
Acknowledgements
Red Hat would like to thank Evan Hendra (Independent Security Researcher) for reporting this issue.
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