validation bypass
Intermediate level
2File Upload — extension, content-type and magic bytes bypasses
10 bypasses to upload webshells: double extension, null byte, content-type spoof, magic bytes, polyglots, race conditions and path traversal abuse.
Open Redirect via Backslash Bypass in the OAuth Login's redirect_url
The client-side validator checks //, : and /. The backslash slips through. Browsers normalize it to a slash and the victim ends up on evil.tld with an active session cookie.
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