CVE-2026-16442

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This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account."}], "id": "CVE-2026-16442", "lastModified": "2026-08-10T19:21:47.070", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-16442", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-05T15:40:39.570480Z", "version": "2.0.3"}}]}, "published": "2026-08-05T16:16:52.027", "references": [{"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:50846"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:50847"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:50848"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:50849"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-16442"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2503138"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-346"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Paul Bottinelli (Trail of Bits) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2026:50847", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-operator-bundle:26.4.14-1", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50847", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-rhel9:26.4-22", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50847", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk/keycloak-rhel9-operator:26.4-22", "product_name": "Red Hat build of Keycloak 26.4", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50846", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "keycloak-services", "product_name": "Red Hat build of Keycloak 26.4.14", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50846", "cpe": "cpe:/a:redhat:build_keycloak:26.4::el9", "package": "rhbk-openshift-rhel9/rhbk-openshift-rhel9", "product_name": "Red Hat build of Keycloak 26.4.14", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50849", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-operator-bundle:26.6.5-1", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50849", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-rhel9:26.6-11", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50849", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk/keycloak-rhel9-operator:26.6-11", "product_name": "Red Hat build of Keycloak 26.6", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50848", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "keycloak-services", "product_name": "Red Hat build of Keycloak 26.6.5", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50848", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk-keycloak-rhel9/rhbk-keycloak-rhel9", "product_name": "Red Hat build of Keycloak 26.6.5", "release_date": "2026-08-05T00:00:00Z"}, {"advisory": "RHSA-2026:50848", "cpe": "cpe:/a:redhat:build_keycloak:26.6::el9", "package": "rhbk-openshift-rhel9/rhbk-openshift-rhel9", "product_name": "Red Hat build of Keycloak 26.6.5", "release_date": "2026-08-05T00:00:00Z"}], "bugzilla": {"description": "keycloak-services: keycloak-services: SAML IdP-initiated broker login bypasses link-only restriction", "id": "2503138", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2503138"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "verified"}, "cwe": "CWE-346", "details": ["A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account."], "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-2026-16442", "package_state": [{"cpe": "cpe:/a:redhat:jboss_data_grid:8", "fix_state": "Not affected", "package_name": "keycloak-services", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Not affected", "package_name": "keycloak-services", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Not affected", "package_name": "keycloak-services", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2026-08-05T02:02:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-16442\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-16442"], "statement": "The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it allows for an authentication bypass. Successful exploitation allows an attacker to obtain a full authenticated session as a linked local user, bypassing administrative restrictions. The vulnerability's root cause is the lack of enforcement of the link-only configuration within the SAML IdP-initiated SSO endpoint.", "threat_severity": "Important"}

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