🛡️ CVE-2024-40627
🟡 CVSS 5.8 — Medium ✅ No Known Exploit CWE-204 NVD
5.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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 any policy. If an application provides different responses to HTTP `OPTIONS` requests based on an entity existing (such as to indicate whether an entity is writable on a system level), an unauthenticated attacker could discover which entities exist within an application. This issue has been addressed in release version 2.0.1. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Details

Severity Medium
CVSS Score 5.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
CWE CWE-204
Public Exploit ✅ No
Source NVD
Published 2024-07-15
Updated 2026-06-02
Modified 2024-07-15
Fix URL N/A

Affected Packages

Software From version Fixed in
fastapi-opa — 2.0.1
unknown — —

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