W-UPLOAD-BYPASSInitial Access

File Upload Filter Bypass

Bypass extension/MIME/magic-byte checks via double extensions (.php.jpg), null bytes, polyglots, content-type spoof.

§ Where this technique fits

W-UPLOAD-BYPASS is catalogued under the Initial Access tactic of the offensive-security kill-chain. It appears in 1 approved dossier in the registry, typically at step 2 on average.

§ Dossiers chaining this technique

File upload bypass → webshell → RCE
Upload filter checks extension or MIME but not magic bytes / final path. Bypass via double extension, content-type spoof, or polyglot, then call the dropped script.
step 2 / 6

§ What commonly comes next

01
Webshell Deployment
W-WEBSHELL · Persistence
seen 1×

§ Where this technique fits

§ Dossiers chaining this technique

File upload bypass → webshell → RCE

§ What commonly comes next