This article is about how I found a vulnerability on Apple forgot password endpoint that allowed me to takeover an iCloud account. The vulnerability is completely patched by Apple security team and it no longer works. Apple Security Team rewarded me $18,000 USD as a part of their bounty program but I refused to receive it. Please read the article to know why I refused the bounty.

After my Instagram account takeover vulnerability, I realized that many other services are vulnerable to race hazard based brute forcing. So I kept reporting the same with the affected service providers like Microsoft, Apple and a few others.

Many people mistook this vulnerability as typical brute force attack but it isn’t. Here we are sending multiple concurrent requests to the server to exploit the race condition vulnerability present in the rate limits making it possible to bypass it.

Now lets see what I found in Apple.

Read in full here:

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