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Cross-site Scripting occurrences in Linux Desktop
Insufficient encoding of URL fragment identifiers in Blink in Google Chrome prior to 65.0.3325.146 allowed a remote attacker to perform a DOM based XSS attack via a crafted HTML page. (2018-11-14, CVE-2018-6076)
XSS vulnerabilities in Interstitials in Google Chrome prior to 65.0.3325.146 allowed an attacker who convinced a user to install a malicious extension or open Developer Console to inject arbitrary scripts or HTML via a crafted HTML page. (2018-11-14, CVE-2018-6081)
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>