CVE-2026-1486

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Si un administrador deshabilita un IdP (por ejemplo, debido a un compromiso o una baja), una entidad que posea la clave de firma de ese IdP a\u00fan puede generar aserciones JWT v\u00e1lidas que Keycloak acepta, lo que resulta en la emisi\u00f3n de tokens de acceso v\u00e1lidos."}], "id": "CVE-2026-1486", "lastModified": "2026-07-15T02:18:14.947", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "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:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "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:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-1486", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-09T20:53:28.857999Z", "version": "2.0.3"}}]}, "published": "2026-02-09T20:15:55.717", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:2365"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:2366"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-1486"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2433347"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:2365"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:2366"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-1486"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2433347"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1486.json"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-358"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-358"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Joy Gilbert Dan and Reynaldo Immanuel for reporting this issue.", "bugzilla": {"description": "org.keycloak.protocol.oidc.grants: Disabled identity providers are still accepted for JWT Authorization Grant", "id": "2433347", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2433347"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-358", "details": ["A flaw was found in Keycloak. A vulnerability exists in the jwt-authorization-grant flow where the server fails to verify if an Identity Provider (IdP) is enabled before issuing tokens. The issuer lookup mechanism (lookupIdentityProviderFromIssuer) retrieves the IdP configuration but does not filter for isEnabled=false. If an administrator disables an IdP (e.g., due to a compromise or offboarding), an entity possessing that IdP's signing key can still generate valid JWT assertions that Keycloak accepts, resulting in the issuance of valid access tokens."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, administrators should immediately revoke or rotate the signing keys associated with any Identity Provider that has been disabled in Keycloak. This operational control is crucial to prevent unauthorized token issuance by ensuring that compromised or offboarded IdP keys cannot be used to generate valid JWT assertions."}, "name": "CVE-2026-1486", "package_state": [{"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Affected", "package_name": "rhbk/keycloak-rhel9", "product_name": "Red Hat Build of Keycloak"}], "public_date": "2026-02-09T18:23:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-1486\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-1486"], "statement": "This vulnerability is rated Important for Red Hat products because Keycloak, when configured with JWT authorization grants, fails to verify the enabled status of an Identity Provider (IdP). An attacker possessing the IdP's signing key can issue valid access tokens even if the IdP has been administratively disabled, leading to unauthorized access.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "product": "build_of_keycloak", "vendor": "redhat"}], "analysis": {"en": {"generated_at": "2026-04-17T21:20:18.853661+00:00", "value": {"mitigation_remediation": ["Immediately revoke or rotate the signing keys for any IdP that has been disabled in Keycloak.", "Apply the vendor-issued patch or upgrade to the most recent Keycloak release that resolves the jwt-authorization-grant issue.", "Remove or disable unused or revoked IdPs from the Keycloak configuration to prevent accidental token acceptance.", "Monitor Keycloak logs for unexpected token issuance and audit access token usage."], "summary": {"action": "Mitigate Keys", "impact": "Unauthorized Token Issuance"}, "threat_synthesis": {"affected_systems": "Red Hat build of Keycloak 26.4, including version 26.4.9 on Red Hat Enterprise Linux 9, is affected. The vulnerability was identified by Red Hat and documented for the Red Hat build of Keycloak 26.4.", "description_and_impact": "A flaw in the jwt-authorization-grant flow of Keycloak causes the server to issue tokens without confirming that the Identity Provider (IdP) is enabled. By bypassing the isEnabled check, Keycloak accepts JWT assertions signed with a disabled IdP's private key, resulting in the issuance of valid access tokens to attackers who possess that key.", "risk_and_exploitability": "The CVSS score of 8.8 indicates high severity, while the EPSS score of less than 1% suggests exploitation is currently unlikely but possible. Because the vulnerability requires an attacker to possess a disabled IdP's signing key, the attack surface is limited to environments where compromised or offboarded keys are accessible. If an attacker obtains the key, the flaw permits the creation of valid tokens that grant access to protected resources, potentially enabling impersonation or privilege escalation. The flaw is not listed in CISA\u2019s KEV catalog."}}}}, "created": "2026-02-10T15:37:35.054919+00:00", "updated": "2026-04-17T21:30:28.385457+00:00", "vendors": ["redhat", "redhat$PRODUCT$build_of_keycloak"]}