CVE-2025-64521: authentik deactivated service accounts can authenticate to OAuth

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-11-19 · updated 2026-10-18
Weakness: CWE-289

Description

authentik is an open-source Identity Provider. Prior to versions 2025.8.5 and 2025.10.2, when authenticating with client_id and client_secret to an OAuth provider, authentik creates a service account for the provider. In previous authentik versions, authentication for this account was possible even when the account was deactivated. Other permissions are correctly applied and federation with other providers still take assigned policies correctly into account. authentik versions 2025.8.5 and 2025.10.2 fix this issue. A workaround involves adding a policy to the application that explicitly checks if the service account is still valid, and deny access if not.

Affected products

goauthentik authentik: from 2025.8.0 before 2025.8.5; from 2025.10.0 before 2025.10.2 — fixed in 2025.10.2, 2025.8.5

How to fix

Upgrade to a fixed version: goauthentik authentik 2025.10.2, 2025.8.5. Check the vendor advisory for mitigations.

References

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