ZAP HUD is active scanning all websites referred to by the original site you want to scan, even if they are not in allow list.
Description:
I'm running ZAP 2.11.1 on Ubuntu 20.04 inside a VM (VirtualBox). I was
testing ZAP on JuiceShop for one of my course. I started ZAP, then I
started the preconfigured Firefox Browser. I visited 127.0.0.1:3000
(juiceshop) and then chose to run the Spider, Ajax Spider, Active
scanning on the 127.0.0.1:3000.
Suddenly after sometime, I found out that it's actually scanning other
websites which mostly used by firefox and mozilla for different
activities, such a: stop-tracking, etc
I thought that I misconfigured the test. I repeated the test again but this time I disabled the the network on the whole physical machine, I found out that it tried to active-scan firefox URLs but it got error 502 since there is no network this time.
I checked the log of the previous session and it's the same thing. HUD is trying to scan all sites.
Just to be clear here, in the log I got the history marks these requests as "Manual" and even I some requests were processed by ZAP and I got the window asking me whether I want to reply in console or in the browser ?