Auth bypass in Red Hat Build Of Keycloak 26.4
CVE-2026-3009
A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an Identity Provider (IdP) even after it has been disabled by an administrator. An attacker who knows the IdP alias can reuse a previously generated login request to bypass the administrative restriction. This undermines access control enforcement and may allow unauthorized authentication through a disabled external provider.
Vulnerability class: Broken Access Control
EPSS: 0.003 (26.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Red Hat Build Of Keycloak 26.4 — versions 26.4.10-1, 26.4-12
- Red Hat Build Of Keycloak 26.4.10
- Red Hat Jboss Enterprise Application Platform 8
- Red Hat Jboss Enterprise Application Platform Expansion Pack
- Red Hat Single Sign-on 7
- Redhat Build_of_keycloak — versions 26.4, 26.4.10
- Redhat Jboss_enterprise_application_platform — versions 8.0
- Redhat Jboss_enterprise_application_platform_expansion_pack
- Redhat Single_sign-on — versions 7.0
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory, Vendor Advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory, Vendor Advisory)
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-3009?
- CVE-2026-3009 is a high-severity vulnerability in Red Hat Build Of Keycloak 26.4, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2026-03-05.
- How severe is CVE-2026-3009?
- High severity. CVSS v3 base score is 8.1 out of 10.