CVE-2026-40166

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{"affected": [{"affectedData": [{"product": "authentik", "vendor": "goauthentik", "versions": [{"status": "affected", "version": "< 2025.12.5"}, {"status": "affected", "version": ">= 2026.2.0-rc1, < 2026.2.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "authentik is an open-source identity provider. In versions prior to 2025.12.5 and 2026.2.0-rc1 through 2026.2.2, authenticated non-admin users with at least one OAuth2 access token can retrieve the client_secret of confidential OAuth2 providers they have previously authenticated against, exposing sensitive information to users without the correct permissions. This logic is GET /api/v3/oauth2/access_tokens/. The API response includes a nested provider object containing client_id and client_secret for providers configured with client_type: confidential, which should not be accessible to low-privilege users. This issue has been fixed in versions 2025.12.5 and 2026.2.3."}, {"lang": "es", "value": "authentik es un proveedor de identidad de c\u00f3digo abierto. En versiones anteriores a 2025.12.5 y 2026.2.0-rc1 hasta 2026.2.2, los usuarios autenticados no administradores con al menos un token de acceso OAuth2 pueden recuperar el client_secret de proveedores OAuth2 confidenciales contra los que se han autenticado previamente, exponiendo informaci\u00f3n sensible a usuarios sin los permisos correctos. Esta l\u00f3gica es GET /API/v3/oauth2/access_tokens/. La respuesta de la API incluye un objeto de proveedor anidado que contiene client_id y client_secret para proveedores configurados con client_type: confidential, lo cual no deber\u00eda ser accesible para usuarios con bajos privilegios. Este problema ha sido solucionado en las versiones 2025.12.5 y 2026.2.3."}], "id": "CVE-2026-40166", "lastModified": "2026-07-23T16:10:00.137", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40166", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-26T18:47:45.180359Z", "version": "2.0.3"}}]}, "published": "2026-05-22T19:17:03.763", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.5"}, {"source": "security-advisories@github.com", "url": "https://github.com/goauthentik/authentik/releases/tag/version%2F2026.2.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/goauthentik/authentik/security/advisories/GHSA-hhpc-rqgm-pxj4"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2025.12.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2026.2.0-rc1,2026.2.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "authentik", "source": "cna", "vendor": "goauthentik"}, "product": "authentik", "vendor": "goauthentik"}], "created": "2026-05-22T20:30:05.784148+00:00", "updated": "2026-05-22T20:30:06.075182+00:00", "vendors": ["goauthentik", "goauthentik$PRODUCT$authentik"]}