Cross-Site Scripting vulnerability in Gwolle Guestbook WordPress Plugin

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Cross-Site Scripting vulnerability in Gwolle Guestbook WordPress Plugin
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Radjnies Bhansingh, July 2016

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Abstract
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A Cross-Site Scripting vulnerability was found in the Gwolle Guestbook
WordPress plugin. This issue allows an attacker to perform a wide
variety of actions, such as stealing Administrators session tokens, or
performing arbitrary actions on their behalf. In order to exploit this
issue, the attacker has to lure a WordPress user with editor or
administrator privileges into opening a malicious website.

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OVE ID
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OVE-20160712-0033

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Tested versions
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This issue was succesfully tested on the Gwolle Guestbook WordPress
Plugin version 1.7.4.

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Fix
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This issue was fixed in Gwolle Guestbook version version 2.1.1. The most
recent version of Gwolle Guestbook can be obtained from the following
location:
https://wordpress.org/plugins/gwolle-gb/

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

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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.