Sharing permissions are settings that control who can access a file, conversation, or other resource. A resource may be private to its owner, available to people with a specific link, or visible to a broader group. Depending on the platform, permissions may separately govern viewing, editing, searching, or resharing.
These settings matter because overly broad access can expose sensitive content or its metadata, such as titles and listings, even when full messages remain protected. In real attacks, someone may exploit a public link or permissive discovery feature to find resources they were not meant to see. Defenders should limit access to the smallest necessary audience, review shared links and inherited permissions, and test whether unauthorized users can search for or enumerate shared items.