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Date: Mon, 2 Dec 2019 19:53:38 -0600
From: Ho oper Ca ry <>
Subject: [FD] Reflected XSS in CSS Hero (v.4.0.3)


Document Title



Reflected XSS in CSS Hero (<= v.4.0.3) WordPress plugin.

Product Description


CSS Hero WordPress Plugin

A live WordPress Theme editor that works without modifying any of your
theme files. Very low performance footprint: only generates and adds a
single static CSS file to your site.


CSS Hero is vulnerable to a reflected XSS attack (authenticated).




1) Authenticate to the WordPress application with the CSS Hero plugin installed.

2) Navigate to the following vulnerable link:


3) JavaScript executes within the context of the browser.  The
arbitrary parameter and value are reflected into the returned HTML.

Responsible Disclosure Information


Vendor Contacted: 11/17

Date Patched: 11/20

Patched Version: v.4.0.7

Public Disclosure: 12/2

Cary Hooper


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