What’s Vulnerable › Vulnerabilities

CVE-2026-2366: Keycloak: keycloak: information disclosure via authorization bypass in admin api

• Severity: low (CVSS 3.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-12 · updated 2026-08-18
• Weakness: CWE-639

Description

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.

Affected products

• Red Hat build of Keycloak 26.4: from 26.4 before 26.4.11 — fixed in 26.4.11

How to fix

Upgrade to a fixed version: Red Hat build of Keycloak 26.4 26.4.11. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:6477
• https://access.redhat.com/errata/RHSA-2026:6478
• https://access.redhat.com/security/cve/CVE-2026-2366
• https://bugzilla.redhat.com/show_bug.cgi?id=2439081

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