[EXPERT] File Upload Vulnerability 7 | Web Shell Upload via Race Condition #BugBounty

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This video is for Educational purposes only.
https://portswigger.net/web-security/file-upload
https://portswigger.net/web-security/file-upload/lab-file-upload-remote-code-execution-via-polyglot-web-shell-upload

Steps to solve:
1. Login as wiener.
2. Upload a hmca.php . Intercept and send to repeater.
3. Create another request in repeater with same cookie and request the same hmca.php file that you upload.
GET /files/avatars/hmca.php
4. Add both tabs to a group and select, Send group in parallel.

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