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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2023-48228

OAuth2: PKCE can be fully circumvented

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

goauthentik authentik

  • < 2023.10.4affected
  • < 2023.8.5affected

References