CVE-2021-29456

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{"affected": [{"affectedData": [{"product": "authelia", "vendor": "authelia", "versions": [{"status": "affected", "version": "<= 4.27.4"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:authelia:authelia:*:*:*:*:*:*:*:*", "matchCriteriaId": "8CE1C08B-D5C4-41B8-9C55-E08A07AF7FF4", "versionEndExcluding": "4.28.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Authelia is an open-source authentication and authorization server providing 2-factor authentication and single sign-on (SSO) for your applications via a web portal. In versions 4.27.4 and earlier, utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain, including potentially malicious sites. This security issue does not directly impact the security of the web application itself. As a workaround, one can use a reverse proxy to strip the query parameter from the affected endpoint. There is a patch for version 4.28.0."}, {"lang": "es", "value": "Authelia es un servidor de autorizaci\u00f3n y autenticaci\u00f3n de c\u00f3digo abierto que proporciona autenticaci\u00f3n de 2 factores e inicio de sesi\u00f3n \u00fanico (SSO) para sus aplicaciones por medio de un portal web.&#xa0;En versiones 4.27.4 y anteriores, usando un par\u00e1metro de consulta HTTP, un atacante puede redireccionar a usuarios desde la aplicaci\u00f3n web a cualquier dominio, incluyendo sitios potencialmente maliciosos.&#xa0;Este problema de seguridad no afecta directamente la seguridad de la aplicaci\u00f3n web en s\u00ed.&#xa0;Como soluci\u00f3n alternativa, se puede usar un proxy inverso para eliminar el par\u00e1metro query del endpoint afectado.&#xa0;Se presenta un parche para versi\u00f3n 4.28.0"}], "id": "CVE-2021-29456", "lastModified": "2026-06-17T03:47:40.713", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.9, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 6.8, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-04-21T19:15:35.827", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/authelia/authelia/security/advisories/GHSA-36f2-fcrx-fp4j"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/authelia/authelia/security/advisories/GHSA-36f2-fcrx-fp4j"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-601"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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