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Cross-site Scripting occurrences in Evernote
Evernote 6.15 on Windows has an incorrectly repaired stored XSS vulnerability. An attacker can use this XSS issue to inject Node.js code under Present mode. After a victim opens an affected note under Present mode, the attacker can read the victim's files and achieve remote execution command on the victim's computer. (2019-05-13, CVE-2018-18524)
The Markdown component in Evernote (Chinese) before 8.3.2 on macOS allows stored XSS, aka MAC-832. (2018-12-22, CVE-2018-20351)
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>