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Cross-site Scripting occurrences in Booking Core
Laravel Booking System Booking Core 2.0 is vulnerable to Cross Site Scripting (XSS). The Avatar upload in the My Profile section could be exploited to upload a malicious SVG file which contains Javascript. Now if another user/admin views the profile and clicks to view his avatar, an XSS will trigger. (2021-10-04, CVE-2021-37330)
Cross Site Scripting (XSS) vulnerability in Booking Core - Ultimate Booking System Booking Core 1.7.0 via the (1) "About Yourself” section under the “My Profile” page, " (2) “Hotel Policy” field under the “Hotel Details” page, (3) “Pricing code” and “name” fields under the “Manage Tour” page, and (4) all the labels under the “Menu” section. (2021-07-14, CVE-2020-25444)
Why Cross-site Scripting can be dangerous
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>