Mutillidae - HTML Injection (HTML5 Web Storage)

Mutillidae – HTML Injection (HTML5 Web Storage)

In this walk through, we will be going through the HTML Injection (HTML5 Web Storage) vulnerability section from Mutillidae Labs. We will be exploring and exploiting HTML Injection in HTML5 Web Storage and learn how application are affected because of it. So, let’s get started with the Hacking without any delay.

HTML Injection (HTML5 Web Storage)

Security Level: 0 (Hosed)

  • Setting the security level to 0 or Hosed.

Security level 0

  • The application has a functionality to add values to the web storage and displays the stored value. We also added one of ours.

HTML5 Web Storage

added key

  • Let’s grab the item with the help of XSS.


javascript console

We love KGB pop up alert

Also Read: Mutillidae – HTML Injection (Back Button)



So, we finally completed all the security levels for the HTML Injection (HTML5 Web Storage) Vulnerability. We looked into the various ways how application has been set up in various levels and how we can bypass the security controls implemented. Next, we can mitigate the potential HTML Injection attacks by performing input sanitization on endpoints, whitelist the allowed characters in the input and using a WAF. Along with that, we can prevent data from any untrusted source to be dynamically written to the HTML document. On that note, i will take your leave and will meet you in next one with another Mutillidae vulnerability writeup, till then “Keep Hacking”.

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