Headline
CVE-2021-41182: XSS in the `altField` option of the Datepicker widget
jQuery-UI is the official jQuery user interface library. Prior to version 1.13.0, accepting the value of the altField option of the Datepicker widget from untrusted sources may execute untrusted code. The issue is fixed in jQuery UI 1.13.0. Any string value passed to the altField option is now treated as a CSS selector. A workaround is to not accept the value of the altField option from untrusted sources.
Impact
Accepting the value of the altField option of the Datepicker widget from untrusted sources may execute untrusted code. For example, initializing the datepicker in the following way:
$( “#datepicker” ).datepicker( { altField: "<img onerror=’doEvilThing()' src=’/404’ />", } );
will call the doEvilThing function.
Patches
The issue is fixed in jQuery UI 1.13.0. Any string value passed to the altField option is now treated as a CSS selector.
Workarounds
A workaround is to not accept the value of the altField option from untrusted sources.
For more information
If you have any questions or comments about this advisory, search for a relevant issue in the jQuery UI repo. If you don’t find an answer, open a new issue.
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