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WordPress Genericons XSS Protection Guide (example.html)

In this guide, we cover the Genericons example.html XSS vulnerability affecting WordPress sites.
You will learn the impact of the vulnerability, whether your site is at risk and exact solution steps.

What Will You Learn in This Guide?​

  • What is Genericons XSS vulnerability and why is it dangerous?
  • How to check if your site is affected
  • Update and manual cleaning methods
  • How to protect yourself from similar security risks

What is a Vulnerability?​

This vulnerability is not caused by WordPress core, but by the icon pack called Genericons.
Genericons were included in the default TwentyFifteen theme.

Problem file:

  • example.html

This file was added for example purposes.
However, the jQuery code inside caused the risk of DOM-based XSS.

This type of attack cannot be blocked by the server because it runs within the browser.
The user simply clicks on a specially prepared link.

Which Components Affected?​

The vulnerability was detected in the following components:

  • TwentyFifteen theme
  • Some versions of the Jetpack plugin
  • Some themes and plugins that use genericons

Is My Site Affected?​

WordPress 4.2.2 version closes this gap.
If you updated after this date, there is no risk.

For manual checking, run the following command on the server:

find . -path "*/genericons/example.html"
  • This command lists example.html files in Genericons.

Sample output:


./wp-content/themes/twentyfifteen/genericons/example.html
  • If this file exists, your site is at risk.

How Do I Close the Security Vulnerability?​

1. Recommended Method: WordPress Update

  • Upgrade to 4.2.2 or higher from the WordPress panel.
  • Be sure to update the theme and plugins.

This method covers all security patches.

2. Manual Cleanup (Workaround)

  • If you cannot update, you can delete the file manually:

sudo find . -path "*/genericons/example.html" -exec rm -f {} \;
  • This command deletes harmful example.html files.

3. Check back later:


find . -path "*/genericons/example.html"
  • The list should return empty.

Frequently Asked Questions (FAQ)​

1. Is this vulnerability in WordPress core? No. It is caused by the open Genericons package.

2. Is only TwentyFifteen affected? No. Themes and plugins that use genericons may be affected.

3. Am I safe without updating? Manual deletion is a temporary solution. Update recommended.

4. Is this vulnerability still valid? It has been closed in current WordPress versions.

Result​

Genericons example.html XSS vulnerability is an easy but critical security problem. Updating regularly is the foundation of WordPress security.

You can immediately publish your infrastructure on GenixNode for secure and up-to-date WordPress projects.