Description
PeopleSoft supports its own Single Sign-On technology based on the PS_TOKEN cookie. PS_TOKEN is signed with a PS node password. Your application is using a weak/known node password and Acunetix managed to guess this password.
Remediation
Change the value of the Node Password to a long random string.
References
Oracle PeopleSoft Applications are Under Attack
PeopleSoft Security. Part 3: PeopleSoft SSO & TokenChpoken Attack