Keycloak IdentityBroker Auth Bypass via Disabled IdP
CVE-2026-3009 Published on March 5, 2026
Org.keycloak/keycloak-services: improper enforcement of disabled identity provider in identitybrokerservice (authentication bypass)
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 Analysis
CVE-2026-3009 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Timeline
Reported to Red Hat.
Made public. 10 days later.
Weakness Type
What is an AuthZ Vulnerability?
The software does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-3009 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-3009
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Affected Versions
Red Hat build of Keycloak 26.4:- Version 26.4.10-1 and below * is unaffected.
- Version 26.4-12 and below * is unaffected.
- Version 26.4-12 and below * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.