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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.

PUBLISHED Reserved 2026-02-23 | Published 2026-03-05 | Updated 2026-03-06 | Assigner redhat




HIGH: 8.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem types

Improper Authorization

Product status

Default status
affected

26.4.10-1 (rpm) before *
unaffected

Default status
affected

26.4-12 (rpm) before *
unaffected

Default status
affected

26.4-12 (rpm) before *
unaffected

Default status
unaffected

Default status
unknown

Default status
unknown

Default status
unknown

Timeline

2026-02-23:Reported to Red Hat.
2026-03-05:Made public.

References

access.redhat.com/errata/RHSA-2026:3947 (RHSA-2026:3947) vendor-advisory

access.redhat.com/errata/RHSA-2026:3948 (RHSA-2026:3948) vendor-advisory

access.redhat.com/security/cve/CVE-2026-3009 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2441867 (RHBZ#2441867) issue-tracking

cve.org (CVE-2026-3009)

nvd.nist.gov (CVE-2026-3009)

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