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{"acknowledgement": "Red Hat would like to thank yd1ng for reporting this issue.", "bugzilla": {"description": "keycloak-services: keycloak-services: SAML broker ignores ProxyRestriction delegation constraints", "id": "2535815", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535815"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-862", "details": ["A flaw was found in the SAML brokering component of Keycloak, an identity and access management solution. The issue occurs when Keycloak acts as an intermediary between an upstream identity provider and downstream services. Keycloak fails to respect specific security instructions called ProxyRestrictions in the login messages it receives. This allows a user to log into downstream services even when the original identity provider explicitly forbade further sharing of the login session. As a result, users can bypass security boundaries intended to limit where their identity can be used."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-92856", "package_state": [{"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "keycloak/rhbk-openshift-rhel9", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "keycloak-services", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "rhbk/keycloak-rhel9", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Fix deferred", "package_name": "keycloak-services", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2026-11-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-92856\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-92856"], "statement": "The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires a specific SAML brokering configuration and the presence of ProxyRestriction conditions from a trusted upstream provider. Successful exploitation allows an attacker to bypass identity delegation boundaries and establish unauthorized sessions in downstream service providers. The vulnerability's root cause is the failure of the Keycloak SAML validator to enforce ProxyRestriction constraints during the brokering flow.", "threat_severity": "Moderate"}

{"created": "2026-11-06T02:00:10.167368+00:00", "updated": "2026-11-06T02:00:10.167373+00:00", "vendors": []}