Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.2 and 9.1.1-alpha.1, the Instagram authentication adapter allows clients to specify a custom API URL via the apiURL parameter in authData. This enables SSRF attacks and possibly authentication bypass if malicious endpoints return fake responses to validate unauthorized users. This is fixed in versions 8.6.2 and 9.1.1-alpha.1 by hardcoding the Instagram Graph API URL https://graph.instagram.com and ignoring client-provided apiURL values. No known workarounds are available.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.