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.
History

Tue, 17 Jun 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


cve-icon MITRE

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

cve-icon Vulnrichment

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

cve-icon NVD

Status : Modified

Published: 2024-01-30T17:15:10.913

Modified: 2024-11-21T08:58:05.013

Link: CVE-2024-23647

cve-icon Redhat

No data.