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CVE-2026-3009

8.1 · HIGH

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.

Published Mar 5, 2026CWE-863EPSS 0.49%

Overview

CVE-2026-3009 is a high-severity vulnerability. It was published on March 5, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2026:3947Refaccess.redhat.com/errata/RHSA-2026:3948Refaccess.redhat.com/security/cve/CVE-2026-3009Refbugzilla.redhat.com/show_bug.cgi?id=2441867Refaccess.redhat.com/errata/RHSA-2026:3947Refaccess.redhat.com/errata/RHSA-2026:3948Refaccess.redhat.com/security/cve/CVE-2026-3009Refbugzilla.redhat.com/show_bug.cgi?id=2441867Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3009.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-3009?

CVE-2026-3009 is a high-severity vulnerability. It was published on March 5, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-3009?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-3009?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-3009?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-3009 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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