The React Developer Tools extension registers a message listener with window.addEventListener('message', <listener>) in a content script that is accessible to any webpage that is active in the browser. Within the listener is code that requests a URL derived from the received message via fetch(). The URL is not validated or sanitised before it is fetched, thus allowing a malicious web page to arbitrarily fetch URL’s via the victim's browser.
The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
| Link | Tags |
|---|---|
| https://gist.github.com/CalumHutton/1fb89b64409570a43f89d1fd3274b231 | third party advisory patch |