{"id":"BIT-authentik-2026-40166","summary":"authentik: Non-admin user can retrieve confidential OAuth client_secret via /api/v3/oauth2/access_tokens/","details":"authentik is an open-source identity provider. In versions prior to 2025.12.5 and 2026.2.0 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.","aliases":["CVE-2026-40166","GHSA-hhpc-rqgm-pxj4"],"modified":"2026-07-08T08:26:30.016195630Z","published":"2026-06-01T11:37:27.605Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2025.12.5"},{"type":"WEB","url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2026.2.3"},{"type":"WEB","url":"https://github.com/goauthentik/authentik/security/advisories/GHSA-hhpc-rqgm-pxj4"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40166"}],"affected":[{"package":{"name":"authentik","ecosystem":"Bitnami","purl":"pkg:bitnami/authentik"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2025.12.5"},{"introduced":"2026.2.0"},{"fixed":"2026.2.3"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/authentik/BIT-authentik-2026-40166.json"},"severity":[{"type":"CVSS_V4","score":"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"}]}],"schema_version":"1.7.5"}