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Cross-Site Scripting vulnerability in Google Maps WordPress Plugin
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Julien Rentrop, July 2016

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Abstract
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A Cross-Site Scripting vulnerability was found in the Google Maps
WordPress Plugin. This issue allows an attacker to perform a wide
variety of actions, such as stealing users' session tokens, or
performing arbitrary actions on their behalf. In order to exploit this
issue, the attacker has to lure/force a victim into opening a malicious
website/link.

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OVE ID
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OVE-20160712-0038

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Tested versions
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This issue was successfully tested on Google Maps WordPress Plugin
version 2.1.2.

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Fix
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This issue is resolved in Google Maps version 2.1.4.

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Details
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https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_google_maps_wordpress_plugin.html

This issue exists due to the lack of output encoding on the id URL parameter. The vulnerable code fragment is listed below:

<form action="admin.php?page=hugeitgooglemaps_main&task=edit_cat&id=<?php echo $_GET['id']; ?>" method="post" name="adminform" id="adminform">

Proof of concept

http://<target>/wp-admin/admin.php?page=hugeitgooglemaps_main&task=edit_cat&id=1%22%3E%3Ch3%3EBREAK%3C%2Fh3%3E

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Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.