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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (32.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.004 · change: -0.001
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
- Red Hat Build Of Keycloak — versions 26.4, 26.4.10
- Red Hat Jboss Enterprise Application Platform — versions 8.0
- Red Hat Jboss Enterprise Application Platform Expansion Pack
- Red Hat Single Sign-On — versions 7.0
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:3947 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:3948 (vendor-advisory, Vendor Advisory)
- access.redhat.com/security/cve/CVE-2026-3009 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (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.