{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40166", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-09T19:31:56.014Z", "datePublished": "2026-05-22T18:52:46.650Z", "dateUpdated": "2026-05-26T18:47:57.418Z"}, "containers": {"cna": {"title": "authentik: Non-admin user can retrieve confidential OAuth client_secret via /api/v3/oauth2/access_tokens/", "problemTypes": [{"descriptions": [{"cweId": "CWE-200", "lang": "en", "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-863", "lang": "en", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "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", "version": "4.0"}}], "references": [{"name": "https://github.com/goauthentik/authentik/security/advisories/GHSA-hhpc-rqgm-pxj4", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/goauthentik/authentik/security/advisories/GHSA-hhpc-rqgm-pxj4"}, {"name": "https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.5", "tags": ["x_refsource_MISC"], "url": "https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.5"}, {"name": "https://github.com/goauthentik/authentik/releases/tag/version%2F2026.2.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/goauthentik/authentik/releases/tag/version%2F2026.2.3"}], "affected": [{"vendor": "goauthentik", "product": "authentik", "versions": [{"version": "< 2025.12.5", "status": "affected"}, {"version": ">= 2026.2.0-rc1, < 2026.2.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-22T18:52:46.650Z"}, "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."}], "source": {"advisory": "GHSA-hhpc-rqgm-pxj4", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-26T18:47:45.180359Z", "id": "CVE-2026-40166", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-26T18:47:57.418Z"}}]}}

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{}

{"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"]}