Likely 0-day
OpenText Filr (formerly Micro Focus/Novell Filr) had guest access enabled, allowing unauthenticated users to access the system as a Guest, exposing GuestUser: 'true' and an "Enter as Guest" option on the SSF login page.
id: opentext-filr-guest-access
info:
name: OpenText Filr - Guest Access Enabled
author: pussyca
...