Red Hat Keycloak 26.5.1 Admin API authorization

Summaryinfo

A vulnerability classified as problematic has been found in Red Hat Keycloak 26.5.1. Impacted is an unknown function of the component Admin API. This manipulation causes authorization. This vulnerability is tracked as CVE-2026-2366. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Red Hat Keycloak 26.5.1 and classified as problematic. Affected by this vulnerability is some unknown processing of the component Admin API. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality. The summary by CVE is:

A flaw was found in Keycloak. An authorization bypass vulnerability in the Keycloak Admin API allows any authenticated user, even those without administrative privileges, to enumerate the organization memberships of other users. This information disclosure occurs if the attacker knows the victim's unique identifier (UUID) and the Organizations feature is enabled.

The advisory is shared at bugzilla.redhat.com. This vulnerability is known as CVE-2026-2366. The exploitation appears to be difficult. The attack can be launched remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 04/11/2026).

The vulnerability scanner Nessus provides a plugin with the ID 305939 (Keycloak < 26.4.11 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (305939). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Red Hat

Name

• Keycloak

Version

• 26.5.1

License

• open-source

Website

• Vendor: https://www.redhat.com/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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