Able to access private files when logged in with a different account/provider, which has not been granted access

I appear to be able to read, and overwrite files with a PUT, files in a private folder when logged in to a different account.

The example I found is editing https://andydavison.inrupt.net/private/test.jpg when logged in with https://ldp.demo-ess.inrupt.com/andydavison/. According to the ‘Your storage’ tab at https://andydavison.inrupt.net/, that private folder is not shared with anyone else, and indeed is inaccessible when logged out from both providers.

使用兩個提供者 URL 重現回報的存取行為，在以另一個帳戶登入時，檢查對私有 test.jpg 檔案的讀取和 PUT 請求。追蹤跨提供者存取的授權路徑，並驗證沒有分享權限的帳戶既不能讀取也不能覆寫該私有檔案。