Being hospitable and welcoming to guests is usually considered good manners. That said, being a gracious host does not mean you should be careless with your security.
With regard to PeopleSoft application security, the user GUEST is a default account created with the installation of PeopleSoft. When performing a PeopleSoft security audit, several attributes of the GUEST user are reviewed, including the following - take a look today at your settings:
For the GUEST user: