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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- redhat/build of keycloak · redhat/jboss enterprise application platform · redhat/jboss enterprise application platform expansion pack · redhat/single sign-on
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2026:3947Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3948Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-3009Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2441867Issue Tracking, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3947Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3948Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-3009Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2441867Issue Tracking, Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3009.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.