Skip to main content

Unintended Proxy or Intermediary ('Confused Deputy')

CVE-2025-66415

Medium
6.9/10

Summary

fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. In versions prior to 12.5.0, by crafting a malicious URL, an attacker could access routes that are not allowed, even though the "reply.from" is defined for specific routes in @fastify/reply-from.

  • LOW
  • NETWORK
  • LOW
  • UNCHANGED
  • REQUIRED
  • NONE
  • LOW
  • NONE

CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')

The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor.

References

Advisory Timeline

  • Published