{"id":"CVE-2023-48228","summary":"OAuth2: PKCE can be fully circumvented","details":"authentik is an open-source identity provider. When initialising a oauth2 flow with a `code_challenge` and `code_method` (thus requesting PKCE), the single sign-on provider (authentik) must check if there is a matching and existing `code_verifier` during the token step. Prior to versions 2023.10.4 and 2023.8.5, authentik checks if the contents of `code_verifier` is matching only when it is provided. When it is left out completely, authentik simply accepts the token request with out it; even when the flow was started with a `code_challenge`. authentik 2023.8.5 and 2023.10.4 fix this issue.","aliases":["BIT-authentik-2023-48228","GHSA-fm34-v8xq-f2c3"],"modified":"2026-08-12T03:51:34.741653786Z","published":"2023-11-21T20:48:32.552Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/48xxx/CVE-2023-48228.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-287"]},"references":[{"type":"WEB","url":"https://github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225"},{"type":"WEB","url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2023.10.4"},{"type":"WEB","url":"https://github.com/goauthentik/authentik/releases/tag/version%2F2023.8.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/48xxx/CVE-2023-48228.json"},{"type":"ADVISORY","url":"https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-48228"},{"type":"FIX","url":"https://github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6"},{"type":"FIX","url":"https://github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5"},{"type":"FIX","url":"https://github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14"},{"type":"FIX","url":"https://github.com/goauthentik/authentik/pull/7666"},{"type":"FIX","url":"https://github.com/goauthentik/authentik/pull/7668"},{"type":"FIX","url":"https://github.com/goauthentik/authentik/pull/7669"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/goauthentik/authentik","events":[{"introduced":"0"},{"fixed":"1516fe86dab2f62754a9c37679e0488dcf829c77"},{"introduced":"ed46fd629efd4307040c494faaec544a5cb7b3ee"},{"fixed":"a2a67161ac8b840d63cbaacdfbebb60fd48e901b"},{"fixed":"3af77ab3821fe9c7df8055ba5eade3d1ecea03a6"},{"fixed":"6b9afed21f7c39f171a4a445654cfe415bba37d5"},{"fixed":"b88e39411c12e3f9e04125a7887f12354f760a14"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2023.8.5"},{"introduced":"2023.10.0"},{"fixed":"2023.10.4"}]}}],"versions":["version/2023.8.4","version/2023.10.3","version/2023.10.2","version/2023.10.0","version/2023.8.3","version/2023.8.2","version/2023.8.1","version/2023.8.0","version/2023.6.0","version/2023.5.1","version/2023.2.1","version/2022.12.1","version/2022.12.0","version/2022.10.1","version/2022.9.0","version/2022.8.2","version/2022.8.1","version/2022.7.2","version/2022.6.2","version/2022.5.2","version/2022.5.1","version/2022.4.1","version/2022.3.3","version/2022.2.1","version/2022.1.4","version/2022.1.3","version/2022.1.1","version/2021.12.5","version/2021.12.4","version/2021.12.3","version/2021.12.2","version/2021.12.1","version/2021.12.1-rc5","version/2021.12.1-rc4","version/2021.12.1-rc3","version/2021.12.1-rc2","version/2021.12.1-rc1","version/2021.10.4","version/2021.10.3","version/2021.10.1-rc3","version/2021.9.3","version/2021.9.2","version/2021.9.1","version/2021.9.1-rc3","version/2021.9.1-rc2","version/2021.9.1-rc1","version/2021.8.4","version/2021.8.3","version/2021.8.2","version/2021.8.1","version/2021.8.1-rc2","version/2021.7.1","version/2021.7.1-rc1","version/2021.6.4","version/2021.6.3","version/2021.6.1","version/2021.6.1-rc4","version/2021.6.1-rc3","version/2021.6.1-rc2","version/2021.6.1-rc1","version/2021.5.2","version/2021.5.1","version/2021.5.1-rc10","version/2021.5.1-rc9","version/2021.5.1-rc8","version/2021.4.1","version/2021.4.1-rc2","version/2021.4.1-rc1","version/2021.3.4","version/2021.3.3","version/2021.3.2","version/2021.3.1","version/2021.3.1-rc2","version/2021.3.1-rc1","version/2021.2.3-stable","version/2021.2.2-stable","version/2021.1.3-stable","version/2021.1.2-stable","version/2021.1.1-stable","version/2021.1.1-rc2","version/2021.1.1-rc1","version/0.13.3-stable","version/0.13.2-stable","version/0.13.1-stable","version/0.13.0-stable","version/0.13.0-rc4","version/0.13.0-rc3","version/0.13.0-rc2","version/0.13.0-rc1","version/0.12.11-stable","version/0.12.10-stable","version/0.12.9-stable","version/0.12.8-stable","version/0.12.7-stable","version/0.12.6-stable","version/0.12.5-stable","version/0.12.4-stable","version/0.12.3-stable","version/0.12.2-stable","version/0.12.1-stable","version/0.12.0-stable","version/0.11.0-stable","version/0.10.9-stable","version/0.10.8-stable","version/0.10.7-stable","version/0.10.6-stable","version/0.10.5-stable","version/0.10.4-stable","version/0.10.3-stable","version/0.10.2-stable","version/0.10.1-stable","version/0.10.0-stable","version/0.10.0-rc6","version/0.10.0-rc5","version/0.10.0-rc4","version/0.10.0-rc3","version/0.10.0-rc2","version/0.10.0-rc1","version/0.9.0-stable","version/0.9.0-rc2","version/0.9.0-rc1","version/0.9.0-pre7","version/0.9.0-pre6","version/0.9.0-pre5","version/0.9.0-pre4","version/0.9.0-pre3","version/0.9.0-pre2","version/0.9.0-pre1","version/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