Authentik is an open-source Identity Provider. There is a bug in our implementation of PKCE that allows an attacker to circumvent the protection that PKCE offers. PKCE adds the code_challenge parameter to the authorization request and adds the code_verifier parameter to the token request. Prior to 2023.8.7 and 2023.10.7, a downgrade scenario is possible: if the attacker removes the code_challenge parameter from the authorization request, authentik will not do the PKCE check. Because of this bug, an attacker can circumvent the protection PKCE offers, such as CSRF attacks and code injection attacks. Versions 2023.8.7 and 2023.10.7 fix the issue.
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Tue, 17 Jun 2025 22:15:00 +0000
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2024-01-30T16:10:55.999Z
Updated: 2025-06-17T21:29:18.763Z
Reserved: 2024-01-19T00:18:53.234Z
Link: CVE-2024-23647

Updated: 2025-06-17T21:22:46.803Z

Status : Modified
Published: 2024-01-30T17:15:10.913
Modified: 2024-11-21T08:58:05.013
Link: CVE-2024-23647

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