CVE-2023-48228: authentik is an open-source identity provider. When initialising a oauth2 flow with a `code_challenge` and `code_method` (thus requesting PKCE), the single…

PriorityP353critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

1.24%

65.3th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
goauthentik	authentik	< 2023.10.4	2023.10.4
goauthentik	authentik	< 2023.8.5	2023.8.5
goauthentik	authentik	>= 2023.10.0 < 2023.10.4	2023.10.4

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