Hey Pariah,
This AppleScript works for me when I install WhatRoute.
The commented-out lines represent detective work and aren’t part of the script proper.
-Chris
tell application "System Events"
tell application process "SecurityAgent"
# properties
# UI elements
# attributes
tell window 1
# properties
# UI elements
# attributes
tell text field "Password:"
# properties
# UI elements
# attributes
tell attribute "AXValue"
# properties
set value to "I Am Nuts!"
end tell
end tell
end tell
end tell
end tell