## Apprentice Level - ✅ [[1. Remote code execution via web shell upload]] - ✅ [[2. Web shell upload via Content-Type restriction bypass]] ## Practitioner Level - ✅ [[3. Web shell upload via path traversal]] - ✅ [[4. Web shell upload via extension blacklist bypass]] - ✅ [[5. Web shell upload via obfuscated file extension]] - ✅ [[6. Remote code execution via polyglot web shell upload]] ## Expert Level - ✅ [[7. Web shell upload via race condition]]