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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Red Hat build of Keycloak 26.4", "source": "cna", "vendor": "Red Hat"}, "product": "build_of_keycloak", "vendor": "redhat"}], "analysis": {"en": {"generated_at": "2026-04-02T15:26:07.073426+00:00", "value": {"mitigation_remediation": ["Apply the Red Hat Security Advisories RHSA-2026:6477 and RHSA-2026:6478 to update Keycloak to a fixed version."], "summary": {"action": "Immediate Patch", "impact": "Information Disclosure (Token Theft)"}, "threat_synthesis": {"affected_systems": "Red Hat build of Keycloak version 26.4 and 26.4.11 running on Enterprise Linux 9 systems.", "description_and_impact": "A flaw in Keycloak allows an attacker who can control another path on the same web server to bypass the wildcard redirect_uri validation. By redirecting a user to a forged URI, the attacker can capture the access token issued to the user, leading to theft of authentication credentials and the disclosure of sensitive information.", "risk_and_exploitability": "The vulnerability carries a CVSS score of 7.3, indicating a high severity. EPSS data is not available and the issue is not listed in the CISA KEV catalog. Exploitation requires the attacker to be able to host or influence a path on the same web server, after which the weak validation of wildcard redirect URIs can be leveraged to obtain access tokens. This suggests that the attack vector is likely internal or requires compromised web server controls."}}}}, "created": "2026-04-02T20:12:44.444910+00:00", "updated": "2026-04-02T20:21:24.575619+00:00", "vendors": ["redhat", "redhat$PRODUCT$build_of_keycloak"]}