AIKIDO-2026-10612
fastapi-guard is vulnerable to Security pipeline bypass via CORS preflight short-circuit
50
Medium Risk
This Affects:
fastapi-guardTL;DR
Affected versions of this package are vulnerable to a security-check bypass on CORS preflight requests. Because the library's security middleware runs after the CORS layer, browser preflight requests skip IP banning, rate limiting, and suspicious-pattern detection, letting attackers probe the allowed origins and methods without triggering the protections.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
fastapi-guard is vulnerable to Security pipeline bypass via CORS preflight short-circuit in versions 5.0.0 - 5.2.0.
How to fix this
Upgrade the fastapi-guard library to the patch version.
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