A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-x4p7-7chp-64hq Keycloak: Unauthorized authentication via disabled SAML Identity Provider
Fixes

Solution

No solution given by the vendor.


Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

History

Wed, 18 Mar 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 18 Mar 2026 01:30:00 +0000

Type Values Removed Values Added
Description No description is available for this CVE. A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.
Title keycloak: Keycloak: Unauthorized authentication via disabled SAML Identity Provider Keycloak: keycloak: unauthorized authentication via disabled saml identity provider
Weaknesses CWE-306
References

Mon, 09 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Keycloak
Keycloak keycloak
Vendors & Products Keycloak
Keycloak keycloak

Fri, 06 Mar 2026 00:15:00 +0000

Type Values Removed Values Added
Description No description is available for this CVE.
Title keycloak: Keycloak: Unauthorized authentication via disabled SAML Identity Provider
First Time appeared Redhat
Redhat build Keycloak
CPEs cpe:/a:redhat:build_keycloak:26.2::el9
cpe:/a:redhat:build_keycloak:26.4::el9
Vendors & Products Redhat
Redhat build Keycloak
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

threat_severity

Important


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-03-18T14:10:10.355Z

Reserved: 2026-02-16T21:18:50.125Z

Link: CVE-2026-2603

cve-icon Vulnrichment

Updated: 2026-03-18T14:09:58.436Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-18T02:16:24.813

Modified: 2026-03-18T15:16:30.500

Link: CVE-2026-2603

cve-icon Redhat

Severity : Important

Publid Date: 2026-03-05T11:23:00Z

Links: CVE-2026-2603 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-09T10:08:44Z

Weaknesses