Amelia Cross-site Scripting

The Amelia WordPress plugin is vulnerable to Cross-Site Scripting due to insufficient escaping and sanitization of the lastName parameter found in the ~/src/Application/Controller/User/Customer/AddCustomerController.php file which allows attackers to inject arbitrary web scripts onto a pages that executes whenever a user accesses the booking calendar with the date the attacker has injected the malicious payload into. This affects versions up to and including 1.0.46. (2022-03-23, CVE-2022-0834)

The Amelia WordPress plugin before 1.0.47 does not sanitize and escape the code parameter before outputting it back in an admin page, leading to a Reflected Cross-Site Scripting. (2022-03-21, CVE-2022-0627)

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>