How to control who can see SharePoint files?

It is advisable to manage access mainly through defined groups and owners, limit anonymous or external links as necessary and periodically review members, guests and active links. One-time permissions must be a documented exception.

Risks to review

  • Share with broad links when a specific person or group was enough.
  • Accumulate unique permissions that are difficult to review and withdraw.
  • Delete an access without understanding what process or equipment depends on it.
  • Maintain guests or owners who no longer have a relationship with the site.

Safe recommendations

  1. Identify business owners and purpose of each site.
  2. Use groups for members and visitors instead of user-by-user permissions.
  3. Review links with external access, anonymous or without expiration date.
  4. Limit external sharing based on content sensitivity.
  5. Test the changes with a representative user account.
  6. Document exceptions and schedule regular member and guest reviews.

When to seek specialized help

  • There are many unique permissions or it is not known who inherited access.
  • Sensitive information is handled with guests and external links.
  • There are multiple sites, Microsoft 365 groups, and Teams with different owners.

Reference sources

These public sources provide general good-practice guidance. They do not replace an assessment of your environment.