CVE-2026-9791 is a medium-severity incorrect authorization vulnerability in org.keycloak:keycloak-server-spi-private (maven), affecting versions >= 26.5.0, < 26.6.3. It is fixed in 26.6.3.
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.
The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions. Typical impact: unauthorized data access or execution of privileged operations.
CVE-2026-9791 has a CVSS score of 4.3 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (26.6.3). Upgrading removes the vulnerable code path.
maven
org.keycloak:keycloak-server-spi-private (>= 26.5.0, < 26.6.3)org.keycloak:keycloak-services (>= 26.5.0, < 26.6.3)org.keycloak:keycloak-server-spi-private (<= 26.4.7)org.keycloak:keycloak-services (<= 26.4.7)org.keycloak:keycloak-server-spi-private → 26.6.3 (maven)org.keycloak:keycloak-services → 26.6.3 (maven)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2026-9791 is reachable in your applications. Explore open-source security for your team.
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Already deployed Kodem? See CVE-2026-9791 in your environment →Upgrade the following packages to resolve this vulnerability:
org.keycloak:keycloak-server-spi-private to 26.6.3 or laterorg.keycloak:keycloak-services to 26.6.3 or laterKodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-9791 is a medium-severity incorrect authorization vulnerability in org.keycloak:keycloak-server-spi-private (maven), affecting versions >= 26.5.0, < 26.6.3. It is fixed in 26.6.3. The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions.
CVE-2026-9791 has a CVSS score of 4.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
org.keycloak:keycloak-server-spi-private (maven) (versions >= 26.5.0, < 26.6.3)org.keycloak:keycloak-services (maven) (versions >= 26.5.0, < 26.6.3)Yes. CVE-2026-9791 is fixed in 26.6.3. Upgrade to this version or later.
Whether CVE-2026-9791 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
org.keycloak:keycloak-server-spi-private to 26.6.3 or laterorg.keycloak:keycloak-services to 26.6.3 or later