Cloudreve has Broken Access Control - Revoked Share Access Still Allows Signed File URL Generation via Cached context_hint

Summary Cloudreve's file-listing responses hand the client a contexthint UUID that is meant to speed up follow-up operations. When that hint is replayed on the file/url and file/thumb routes, DBFS caches a shareNavigatorState containing the already-loaded share root and share row. On a later...