CVE-2026-2603

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 85.0, "confidence_source": "inferred", "scores": [{"score": 85.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "keycloak", "vendor": "keycloak"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "26.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "26.4"}}], "enrichment": {"confidence": 90.0, "confidence_source": "inferred", "scores": [{"score": 90.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "build_keycloak", "vendor": "redhat"}], "analysis": {"en": {"generated_at": "2026-04-16T02:43:57.621366+00:00", "value": {"mitigation_remediation": ["Apply the Red\u202fHat update associated with errata RHSA-2026:3925 and RHSA-2026:3926 to patch Keycloak to a fixed version.", "Verify that the SAML identity provider is truly disabled or otherwise block access to the SAML broker endpoint using firewall rules or network segmentation.", "Enable logging of broker login attempts and periodically review logs for anomalous SAML responses that could indicate attempted bypass."], "summary": {"action": "Immediate Patch", "impact": "Unauthorized Authentication"}, "threat_synthesis": {"affected_systems": "Red Hat builds of Keycloak 26.2 (including 26.2.14) and 26.4 (including 26.4.10) running on Red Hat Enterprise Linux 9 are affected by this vulnerability.", "description_and_impact": "The flaw in Keycloak allows a remote attacker to supply a valid SAML response to the SAML endpoint for IdP-initiated broker logins. Even when the target Identity Provider is marked as disabled, the attacker can complete a broker login, effectively authenticating without authorization. This results in the attacker gaining access to resources and user accounts that should remain protected.", "risk_and_exploitability": "The CVSS score of 8.1 indicates high severity. The EPSS score is less than 1\u202f%, meaning real-world exploitation likelihood is low, and the vulnerability is not listed in CISA\u2019s KEV catalog. However, the attack requires the attacker to reach the Keycloak SAML endpoint and craft a valid SAML response, so systems exposed to the network that can accept SAML traffic are the most susceptible. No known public exploitation has been reported, but the impact is significant if exploited."}}}}, "created": "2026-03-09T10:08:44.367117+00:00", "updated": "2026-04-16T02:45:06.091504+00:00", "vendors": ["keycloak", "keycloak$PRODUCT$keycloak", "redhat", "redhat$PRODUCT$build_keycloak"]}