CVE-2024-23647: Authentik vulnerable to PKCE downgrade attack

January 29, 2024 (updated November 18, 2024)

PKCE is a very important countermeasure in OAuth2 , both for public and confidential clients. It protects against CSRF attacks and code injection attacks. Because of this bug, an attacker can circumvent the protection PKCE offers.

References

github.com/advisories/GHSA-mrx3-gxjx-hjqj
github.com/goauthentik/authentik
github.com/goauthentik/authentik/commit/38e04ae12720e5d81b4f7ac77997eb8d1275d31a
github.com/goauthentik/authentik/security/advisories/GHSA-mrx3-gxjx-hjqj
nvd.nist.gov/vuln/detail/CVE-2024-23647

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