IIS calls this "directory browsing." It must be explicitly enabled in the Feature Delegation or via <directoryBrowse enabled="true" /> in web.config .

Disable directory indexing for the affected path and remove or restrict access to the /install directory.

If a directory is writable, an attacker might upload a malicious PHP script (shell) and then use the directory listing to find and execute it.

Attackers see your precise plugin versions, themes, and file structures.

After upload, the attacker verifies the file appears in the index listing:

Allowing the public to view your directory structure is dangerous for several reasons:

autoindex off;

If you need help securing your server, tell me you are running (Apache, Nginx, IIS) or what CMS you use (WordPress, Joomla, etc.) so I can give you the exact commands. Share public link

Reload the Nginx service to apply changes: sudo systemctl reload nginx . Method 3: The "Blank Index" Fallback

An exposed directory listing is a "low-hanging fruit" for attackers. By disabling directory indexing (using Options -Indexes or autoindex off ), you instantly secure your /uploads and /install directories from being crawled and indexed by malicious actors. If you're interested, I can: