Origin Website Cross-site Scripting

Origin Protocol is a blockchain based project. The Origin Protocol project website allows for malicious users to inject malicious Javascript via a POST request to `/presale/join`. User-controlled data is passed with no sanitization to SendGrid and injected into an email that is delivered to the founders@originprotocol.com. If the email recipient is using an email program that is susceptible to XSS, then that email recipient will receive an email that may contain malicious XSS. Regardless if the email recipient’s mail program has vulnerabilities or not, the hacker can at the very least inject malicious HTML that modifies the body content of the email. There are currently no known workarounds. (2022-04-20, CVE-2022-24864)

Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.

The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:

https://server.com/confirmation?message=Transaction+Complete

what results in:

<span>Confirmation: Transaction Complete</span>

In that case the message can be modified to become a valid Javascript code, e.g.:

https://server.com/confirmation?message=<script>dangerous javascript code here</script>

and it will be executed locally by the user's browser with full access to the user's personal application/browser data:

<span>Confirmation: <script>dangerous javascript code here</script></span>