Permission & Access Issues

How to Fix SharePoint Guests Editing Read-Only Documents

Maira Mehtab Sep 22, 2026 869 views

Question details

The user needs to understand why guest users are able to edit documents that are intended to be read-only in SharePoint, and how to restrict this access.

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: Managing site and document permissions to ensure external or guest users only have view access to specific files.
Observed behavior: Guest users retain the ability to edit documents even when the overarching SharePoint site or document library is configured for read-only access.

Before you start

Ensure you have Site Owner or Full Control permissions in your SharePoint environment to view and modify advanced access settings and permission levels.

Solution 1Recommended

Check and Adjust Effective Permissions at the File Level

Use the 'Check Permissions' tool to see exactly how a guest is gaining edit access to a specific file.

Often, edit access overrides read-only settings because a user was given a direct sharing link or belongs to a group with elevated privileges.

Access File Permissions

Select the affected file in your SharePoint library, click the three-dot menu icon, and choose 'Manage access'.

Open Advanced Settings

Scroll down in the Manage Access panel and click on 'Advanced settings' to open the classic permission management page.

Check User Permissions

Click 'Check Permissions' in the top ribbon menu, enter the guest user's name or email address, and click 'Check Now'.

Remove Conflicting Access

Review the results to identify if edit access is granted via group membership, a direct sharing link, or inherited site permissions. Delete the conflicting sharing link or remove the user from the editing group as necessary.

Solution 2

Verify 'Read-Only' Permission Level Configurations

Ensure that the custom or default Read permission level hasn't been accidentally modified to allow item editing.

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Frequently Asked Questions

Why do guests have edit access if the SharePoint site is set to read-only?

Guests may still have edit access due to direct sharing links that grant edit permissions, membership in a SharePoint group with higher permission levels, or individual file-level permissions that override the overall site's read-only setting.

How do I remove a direct sharing link in SharePoint?

Select the file or folder, click the three dots (More options), choose 'Manage access', navigate to the 'Links' or 'Sharing' tab, and click the trash can icon next to the edit link you want to remove.

Does breaking permission inheritance affect guest access?

Yes. If a document library or specific file has broken inheritance, it no longer follows the parent site's primary permission settings. You must manage guest permissions directly on that specific library or file to ensure they remain read-only.

Can I set a SharePoint folder to read-only for external guests only?

Yes, you can create a specific SharePoint group exclusively for external guests, assign that group 'Read' permissions for the targeted folder, and remove any other edit links or group memberships associated with those guest accounts.

Document & File Issues