Direct answer
Identify the shares a Windows device offers, determine why each exists, and evaluate both share and underlying file permissions for the intended users. Test from approved locations with known accounts and harmless files.
Inventory shares and owners
List shares on the authorized machine, their paths, business purposes and owners. Distinguish user-created shares from administrative shares and ask how each is used. Avoid posting share names or internal paths in public reports; they may expose operational detail.
Reference: Microsoft: Get-SmbShare.
Review effective access
Share permissions and NTFS permissions both affect access. Review relevant users and groups, nested directory membership, intended read or write access, and the device's network location. A broad share setting warrants context but does not alone prove that all users can read underlying files.
Test a controlled fixture
Create a harmless test file with a known owner and obtain approved test accounts. Check a legitimate read or write path and a role that should be denied from the appropriate source network. Avoid opening unrelated documents or modifying production files. Record account, path, operation, time and observed result.
Restrict and retest
Agree the intended access matrix with the file owner before narrowing permissions or removing an unused share. Preserve a recovery route and test dependent applications. Repeat allowed and denied cases after the change, including the effective identity and network context.
Assessment limits
A share inventory and selected account tests do not prove every user's effective permissions or cover other file access mechanisms. Permissions and group membership can change after the review.
Frequently asked questions
Does a visible share mean anyone can read its files?
No. Share and file permissions, account membership and network controls all affect access.
Should all administrative shares be removed?
Review their role and management dependencies with the owner before making any change.
Why test an allowed account too?
A positive control helps verify that a permission fix preserves the intended business workflow.
Primary sources and further reading
These guides combine published security guidance with practical assessment planning. Adapt checks to the owner's policy, environment, and authorized scope.
This guide was prepared with AI assistance using the linked sources and illustrative examples. Check current vendor guidance and your environment before making changes.