HabraPoshta and "_".
1. Choose a friend
2. I’m clicking on the “write a letter” picture of her href = http: //evil_random.habrahabr.ru/mail/write/%username%
3. I get on the page 404 with the address http: //evil.habrahabr.ru/_random/mail/write/%username%
2. I’m clicking on the “write a letter” picture of her href = http: //evil_random.habrahabr.ru/mail/write/%username%
3. I get on the page 404 with the address http: //evil.habrahabr.ru/_random/mail/write/%username%
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Source: https://habr.com/ru/post/37270/
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