Php Point Of Sale Cross-site Scripting

The application was found to be vulnerable to an authenticated Stored Cross-Site Scripting (XSS) vulnerability in messaging functionality, leading to privilege escalation or a compromise of a targeted account. (2022-10-31, CVE-2022-40287)

The application was vulnerable to an authenticated Stored Cross-Site Scripting (XSS) in the upload and download functionality, which could be leveraged to escalate privileges or compromise any accounts they can coerce into observing the targeted files. (2022-10-31, CVE-2022-40289)

The application was vulnerable to an authenticated Stored Cross-Site Scripting (XSS) in the user profile data fields, which could be leveraged to escalate privileges within and compromise any account that views their user profile. (2022-10-31, CVE-2022-40288)

The application was vulnerable to an unauthenticated Reflected Cross-Site Scripting (XSS) vulnerability in the barcode generation functionality, allowing attackers to generate an unsafe link that could compromise users. (2022-10-31, CVE-2022-40290)

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>