The WebRequest API implementation in extensions/browser/api/web_request/web_request_api.cc in Google Chrome before 45.0.2454.85 does not properly consider a request's source before accepting the request, which allows remote attackers to bypass intended access restrictions via a crafted (1) app or (2) extension.
Software security is not security software. Here we're concerned with topics like authentication, access control, confidentiality, cryptography, and privilege management.