Guest access allows people outside the company to collaborate in Teams and SharePoint.
This can be useful for customers, vendors, partners, and contractors.
The problem is that guest access can remain long after the project ends.
Businesses should review guest users on a regular schedule and remove access that is no longer needed.
Sensitive teams and SharePoint sites may need stricter rules than general collaboration spaces.
Team owners should understand that inviting a guest creates real access to company information.
Guest collaboration is not unsafe by itself. It becomes risky when no one remembers who was invited or why.
A regular review process keeps external access useful without allowing it to become permanent by accident.