IISv5 has a "Hit-highlighting" functionality that opens some site object and highlights some part of it, that has had a transversal vulnerability in the past. Now it can be used to bypass the IIS authentication.
Protect the files from the NTFS filesystem instead of relying on the
Microsoft recommends not to use IISv5 and update to IISv6.
WordPress Plugin Slideshow Gallery LITE Unspecified Vulnerability (188.8.131.52)
WordPress Plugin OptionTree PHP Object Injection (2.7.2)
WordPress Plugin Appointment Booking Calendar Cross-Site Scripting (1.3.18)
WordPress Plugin UserPro-Community and User Profile Cross-Site Scripting (2.33)
WordPress Plugin Visual Form Builder Cross-Site Scripting (2.8.4)