CVE-2024-40627 OpaMiddleware does not filter HTTP OPTIONS requests

Fastapi OPA is an opensource fastapi middleware which includes auth flow. HTTP OPTIONS requests are always allowed by OpaMiddleware, even when they lack authentication, and are passed through directly to the application. OpaMiddleware allows all HTTP OPTIONS requests without evaluating it against...

CVE-2024-40627

CVE-2024-40627 concerns the Fastapi-OPA OpaMiddleware, which incorrectly allows unauthenticated HTTP OPTIONS requests by bypassing policy evaluation. This can enable an unauthenticated attacker to infer entity existence based on responses, potentially leaking information about writable entities. ...

PT-2024-28950 · Unknown · Fastapi Opa

Name of the Vulnerable Software and Affected Versions: Fastapi OPA versions prior to 2.0.1 Description: The issue allows unauthenticated attackers to discover which entities exist within an application by sending HTTP OPTIONS requests. This is because OpaMiddleware allows all HTTP OPTIONS request...