A flaw was found in Keycloak's Fine-Grained Admin Permissions (FGAPv2) feature. An administrator with limited client management permissions can exploit this vulnerability to assign any realm role, including highly privileged roles, to a client's scope mapping. This bypasses intended security controls, allowing the injected role to be projected into a user's authentication token when they access the modified client. This could lead to unauthorized privilege escalation within the Keycloak realm.

The version of Keycloak installed on the remote host is prior to 26.6.4. It is, therefore, affected by multiple vulnerabilities, including the following:

  - A user with group-admin privileges can escalate to realm-admin, gaining full administrative control     over the realm. (CVE-2026-9099)

  - An authentication bypass exists via JWT algorithm confusion, allowing unauthorized access.
    (CVE-2026-11800)

  - Any authenticated user can bypass all authorization policies, including role, scope, and UMA     permission checks, by including the configured access-denied page path within a request URL, gaining     unauthorized access to protected resources. (CVE-2026-9800)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - A flaw was found in Keycloak's Fine-Grained Admin Permissions (FGAPv2) feature. An administrator with
    limited client management permissions can exploit this vulnerability to assign any realm role, including
    highly privileged roles, to a client's scope mapping. This bypasses intended security controls, allowing
    the injected role to be projected into a user's authentication token when they access the modified client.
    This could lead to unauthorized privilege escalation within the Keycloak realm. (CVE-2026-9795)

ID	Name	Product	Family	Type	Severity
324966	Keycloak < 26.6.4 Multiple Vulnerabilities	Nessus	Misc.	Local	high
444254	SCA: security update for org.keycloak:keycloak-services (GHSA-32h4-44jj-c5vx)	Tenable Cloud Security	SCA Checks	Local	high
444254	SCA: security update for org.keycloak:keycloak-services (GHSA-32h4-44jj-c5vx)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-9795

high

Tenable Plugins

high

high

high