CVE-2026-92857

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Until patched, this is a concern on Keycloak deployments enabling Dynamic Client Registration where users possess an Initial Access Token and editable realm profile attributes, so restrict issuance of Initial Access Tokens, monitor new client registrations, and restrict user capabilities to edit profile attributes. As a compensating measure, detect unauthorized Dynamic Client Registration creations and protocol mapper changes by alerting on configuration drift against declared realm baselines and log Dynamic Client Registration events and mapper configurations to a SIEM to identify unauthorized clients mapping reserved token claims. 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This could allow an attacker to impersonate other users or gain unauthorized access to services that rely on these tokens for identity verification."}], "id": "CVE-2026-92857", "lastModified": "2026-11-09T18:17:35.537", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-92857", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-11-09T17:22:47.306258Z", "version": "2.0.3"}}]}, "published": "2026-11-05T18:17:10.887", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95759"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95760"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95761"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:95762"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-92857"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535817"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Eurico Nicacio (independent) for reporting this issue.", "bugzilla": {"description": "keycloak-services: keycloak-services: DCR protocol mapper config not validated, allowing IAT holders to forge sub and aud claims in signed tokens", "id": "2535817", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535817"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-20", "details": ["Keycloak provides a Dynamic Client Registration feature that allows users with specific tokens to register their own applications. A flaw in how Keycloak validates these registration requests allows an attacker to create a malicious application that forges identity information. By mapping their own user profile details to protected fields like the user ID (sub) or intended audience (aud), an attacker can generate signed security tokens that make them appear to be a different user. This could allow an attacker to impersonate other users or gain unauthorized access to services that rely on these tokens for identity verification."], "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-2026-92857", "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": "Not affected", "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-2026-92857\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-92857"], "statement": "The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that exploitation requires the attacker to possess a valid Initial Access Token and a realm account. Successful exploitation allows an attacker to forge identity claims in signed tokens, leading to user impersonation across access tokens, ID tokens, and UserInfo responses. The vulnerability's root cause is a lack of validation for the claim.name field in protocol mapper configurations during Dynamic Client Registration.", "threat_severity": "Important"}

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