WordPress Plugin WF Cookie Consent 1.1.3 - Cross-Site Scripting

# Exploit Title: WF Cookie Consent - Authenticated Persistent Cross-Site Scripting
# Date: 23/04/2018
# Exploit Author: B0UG
# Vendor Homepage: http://www.wunderfarm.com/
# Software Link: https://en-gb.wordpress.org/plugins/wf-cookie-consent/
# Version: Tested on version 1.1.3 (older versions may also be affected)
# Tested on: WordPress
# Category : Webapps
# CVE: CVE-2018-10371

I. VULNERABILITY
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Authenticated Persistent Cross-Site Scripting

II. BACKGROUND
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WF Cookie Consent is a WordPress plugin which has been designed to display cookie consent notifications on a WordPress website.

III. DESCRIPTION
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A authenticated persistent cross-site scripting vulnerability has been identified in the web interface of the plugin that allows the execution of arbitrary HTML/script code to be executed in a victim's web browser.

IV. PROOF OF CONCEPT
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1) Access WordPress control panel.
2) Navigate to the 'Pages'.
3) Add a new page and insert the script you wish to inject into the page title.
4) Now navigate to 'Settings' and select 'WF Cookie Consent'.
5) Your injected script will now be executed.

V. IMPACT
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An attacker can execute malicious code in a victim's browser to perform various activities such as stealing cookies, session tokens, credentials and personal data amongst others.

VI. SYSTEMS AFFECTED
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WordPress websites running "WF Cookie Consent" plugin version 1.1.3 (older versions may also be affected).

VII. REMEDIATION
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Implement a web application such as Wordfence or uninstall the plugin.

VIII. DISCLOSURE TIMELINE
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April 23, 2018 1: Vulnerability identified.
April 23, 2018 2: Informed developer of the vulnerability.
May 2, 2018 3: No reply from the developer.