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Cross-site Scripting occurrences in Extended Choice Parameter
Jenkins Extended Choice Parameter Plugin 346.vd87693c5a_86c and earlier does not escape the name and description of Extended Choice parameters on views displaying parameters, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Item/Configure permission. (2022-04-12, CVE-2022-29038)
Jenkins Extended Choice Parameter Plugin 346.vd87693c5a_86c and earlier does not escape the value and description of extended choice parameters of radio buttons or check boxes type, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Item/Configure permission. (2022-03-15, CVE-2022-27202)
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>