CVE-2026-3429

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Specifically, an attacker who has already obtained a victim\u2019s password can delete the victim\u2019s registered MFA/OTP credential without first proving possession of that factor. The attacker can then register their own MFA device, effectively taking full control of the account. This weakness undermines the intended protection provided by multi-factor authentication."}, {"lang": "es", "value": "Se identific\u00f3 una vulnerabilidad en la API REST de Cuentas de Keycloak que permite a un usuario autenticado con un nivel de seguridad inferior realizar acciones sensibles destinadas \u00fanicamente a sesiones de mayor garant\u00eda. Espec\u00edficamente, un atacante que ya ha obtenido la contrase\u00f1a de una v\u00edctima puede eliminar la credencial MFA/OTP registrada de la v\u00edctima sin probar primero la posesi\u00f3n de ese factor. El atacante puede entonces registrar su propio dispositivo MFA, tomando efectivamente el control total de la cuenta. Esta debilidad socava la protecci\u00f3n prevista proporcionada por la autenticaci\u00f3n multifactor."}], "id": "CVE-2026-3429", "lastModified": "2026-08-18T16:37:56.480", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 2.5, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3429", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-12T15:43:36.951927Z", "version": "2.0.3"}}]}, "published": "2026-03-11T17:16:59.270", "references": [{"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:6477"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:6478"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-3429"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443771"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "keycloak", "vendor": "keycloak"}], "analysis": {"en": {"generated_at": "2026-04-15T22:39:46.176310+00:00", "value": {"mitigation_remediation": ["Apply Red\u00a0Hat security updates RHSA-2026:6477 and RHSA-2026:6478 to update Keycloak to the patched version.", "Confirm that all Keycloak deployments are running version 26.4.11 or later, which contains the access\u2011control fix.", "If a patch cannot be applied immediately, reconfigure the Account REST API to require multi\u2011factor authentication for credential deletion or restrict the API to high\u2011assurance sessions only.", "No workable workaround is provided; patch remains the only viable mitigation."], "summary": {"action": "Patch Immediately", "impact": "Account Takeover via MFA Deletion"}, "threat_synthesis": {"affected_systems": "The affected products are Red\u00a0Hat Build of Keycloak (including builds 26.4 and 26.4.11), Red\u00a0Hat JBoss Enterprise Application Platform\u00a08 and the Red\u00a0Hat Single Sign\u2011On\u00a07 stack. These environments use the Keycloak account REST API and are vulnerable to the described deletion and takeover scenario.", "description_and_impact": "The vulnerability in Keycloak\u2019s Account REST API allows an authenticated user with a lower security level to delete a victim\u2019s registered multi\u2011factor authentication (MFA) or one\u2011time\u2011password (OTP) credentials without proving possession of that factor. After the deletion the attacker can register their own MFA device and take full control of the account, effectively bypassing the intended MFA protection. This flaw represents an improper access control weakness (CWE\u2011284).", "risk_and_exploitability": "The CVSS score is 4.2, indicating a moderate severity. The EPSS score of less than 1\u202f% suggests that exploitation is currently unlikely, and the vulnerability is not listed in the CISA KEV catalog. Exploitation requires an attacker to already have valid credentials for the victim at a lower security level; once this is achieved, the attacker can delete MFA credentials and register a new device. The attack vector is mediated through the REST API and relies on the existing authenticated session, so widespread exploitation would be limited to environments where these API endpoints are exposed and the attacker has compromised credentials."}}}}, "created": "2026-03-03T08:47:04.300533+00:00", "updated": "2026-04-15T22:45:16.440983+00:00", "vendors": ["keycloak", "keycloak$PRODUCT$keycloak"]}