Stored XSS in icloud.com — $5000

2 min readFeb 14, 2021

Hello Guys hope you all are doing well, fine and healthy during this hard time.

Introduction :

Hello, I am Vishal Bharad, from India and working as Penetration Tester, Now today I am going to share how I found Stored Cross-Site Scripting (XSS) in icloud.com.

Initial Discovery & Exploitation :

First of all I am not the XSS guy :D

Finally I decided to hunt on Apple. As we all know that apple is having large scope so I blindly choose icloud.com and decided to find at least 1 bug on icloud.com.

I tried many vulnerabilities on icloud.com such as CSRF, IDOR, Business Logic Bugs etc. and got nothing. I keep tried to find bugs on icloud.com and after so many attempts I decided to find XSS on icloud.com. (As I am still not good at finding XSS :D)

So here I started the initial recon to find XSS. As we all know that we can try XSS where strings are reflected on webpage or in response.

So I have logged in with icloud.com and inserted payloads everywhere and looked for the webpages where my payloads or strings over getting reflected in response. After so many attempts I got one endpoint where my payload was fired and It was my “Pursuit of Happiness”

XSS fired in Settings >> Browser All Versions.

Below is the step of reproduction where I was able to find stored XSS in icloud.com and got $5000

Steps to Reproduce:

Go to Page/Keynotes https://www.icloud.com/pages/ or https://www.icloud.com/keynotes
Create Pages or Keynote with the name XSS payload “><img src=x onerror=alert(0)>
Send this to the user or collaborate with any user.
Then go to the pages, make some changes and save
again, go to the pages and go to Settings >> Browser All Versions.
After click on Browse All Versions. XSS will trigger

Now I got the XSS. So I decided to make full video that how attacker can able to triggers XSS on victim’s account.

Video is Attached to Demonstrate this Vulnerability.

Please watch full video in which I have demonstrate how 1st user can able to trigger XSS on 2nd user’s account.

Thank You for your time to read this article

Disclosure :