CVE-2026-9791 Keycloak-rhel9: organization data leak after feature disabled in keycloak
Authenticated users can leak organization metadata via APIs or tokens even when the feature is disabled, potentially causing incorrect authorization decisions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-9791?
CVE-2026-9791 is a medium-severity vulnerability in Redhat Build of Keycloak, published on 28 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in Keycloak. An authenticated user with existing organization membership can exploit this flaw by accessing user-facing APIs, such as the account API or by requesting an OpenID Connect (OIDC) token with the 'organization' scope. This allows organization metadata to be disclosed in tokens, even after an administrator has explicitly disabled the Organizations feature, potentially leading to incorrect authorization decisions by resource servers.
Weakness: CWE-863
Which versions are affected by CVE-2026-9791?
8 open source packages ship an affected version, including org.keycloak:keycloak-server-spi-private and org.keycloak:keycloak-services. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-server-spi-private Maven | All versions to 26.4.7 | None |
org.keycloak:keycloak-server-spi-private Maven | All versions to 26.4.7 | None |
org.keycloak:keycloak-server-spi-private Maven | From 26.5.0 | 26.6.3 |
org.keycloak:keycloak-server-spi-private Maven | From 26.5.0 | 26.6.3 |
org.keycloak:keycloak-services Maven | All versions to 26.4.7 | None |
org.keycloak:keycloak-services Maven | All versions to 26.4.7 | None |
2 more packages
org.keycloak:keycloak-services Maven | From 26.5.0 | 26.6.3 |
org.keycloak:keycloak-services Maven | From 26.5.0 | 26.6.3 |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-9791?
Upgrade org.keycloak:keycloak-server-spi-private to 26.6.3 or later.
Is CVE-2026-9791 being exploited?
There is no known exploitation of CVE-2026-9791 in the wild and no public exploit code.
Other vulnerabilities in Redhat Build of Keycloak
- CVE-2026-15572 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
- CVE-2026-3047 Keycloak SAML Broken has Authentication Bypass by Primary Weakness
- CVE-2026-15573 Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
- CVE-2026-16102 Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
- CVE-2026-1609 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
Sources
Also known as ECHO-b064-b0c5-7b0f, GHSA-4q93-v92x-p89f, MINI-m7wc-pgc2-49jm, MINI-vfm6-8v5f-f9xv.