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Date: Wed, 25 Jul 2018 12:00:45 +0200
From: Defense Code <>
Subject: DefenseCode ThunderScan SAST Advisory: WordPress Gwolle Guestbook
 Plugin XSS Security Vulnerability

DefenseCode ThunderScan SAST Advisory: WordPress Gwolle Guestbook
 Plugin XSS Security Vulnerability

Advisory ID:    DC-2018-05-008
Advisory Title: WordPress Gwolle Guestbook Plugin XSS Security
Advisory URL:
Software:       WordPress Gwolle Guestbook plugin
Language:       PHP
Version:        2.5.3 and below
Vendor Status:  Vendor contacted, update released
Release Date:   2018/07/24
Risk:           Medium

1. General Overview
During the security audit of Gwolle Guestbook plugin for WordPress
CMS, security vulnerability was discovered using DefenseCode
ThunderScan application source code security analysis platform.

More information about ThunderScan is available at URL:

2. Software Overview
According to the plugin developers, Gwolle Guestbook is is not just
another guestbook for WordPress. The goal is to provide an easy and
slim way to integrate a guestbook into your WordPress powered site.

According to, it has more than 40,000 active installs.


3. Vulnerability Description
During the security analysis, ThunderScan discovered Cross-Site
Scripting vulnerability in Gwolle Guestbook WordPress plugin.

The Cross-Site Scripting vulnerability can enable the attacker to
construct the URL that contains malicious JavaScript code. If the
administrator of the site makes a request to such an URL, the
attacker's code will be executed, with unrestricted access to the
WordPress site in question. The attacker can entice the administrator
to visit the URL in various ways, including sending the URL by email,
posting it as a part of the comment on the vulnerable site or another

To confirm the vulnerability make sure dashboard widget is added and
that there is at least one unchecked entry in the guestbook. The
vulnerability was tested using Apache web server.

3.1 Cross-Site Scripting
  Vulnerable Function:  echo()
  Vulnerable Variable:  $_SERVER['PHP_SELF']
  Vulnerable URL:"></script><script>alert(42)</script>

  File:                 gwolle-gb/admin/gb-dashboard-widget.php
  150 <a href="<?php echo $_SERVER['PHP_SELF']; ?>"
class="button"><?php esc_html_e('Refresh', 'gwolle-gb'); ?></a>

4. Solution
All users are strongly advised to update WordPress Gwolle Guestbook
plugin to the latest available version.

5. Credits
Discovered by Neven Biruski using DefenseCode ThunderScan source code
security analyzer.

6. Disclosure Timeline
2018/06/01   Vulnerability discovered
2018/06/05   Vendor contacted
2018/07/24   Advisory released to the public

7. About DefenseCode
DefenseCode L.L.C. delivers products and services designed to analyze
and test web, desktop and mobile applications for security

DefenseCode ThunderScan is a SAST (Static Application Security
Testing, WhiteBox Testing) solution for performing extensive security
audits of application source code. ThunderScan SAST performs fast and
accurate analyses of large and complex source code projects delivering
precise results and low false positive rate.

DefenseCode WebScanner is a DAST (Dynamic Application Security
Testing, BlackBox Testing) solution for comprehensive security audits
of active web applications. WebScanner will test a website's security
by carrying out a large number of attacks using the most advanced
techniques, just as a real attacker would.

Subscribe for free software trial on our website .

E-mail: defensecode[at]


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