The PAN-OS management web interface page in PAN-OS 6.1.20 and earlier, PAN-OS 7.1.16 and earlier, PAN-OS 8.0.8 and earlier, and PAN-OS 8.1.0 may allow an attacker to access the GlobalProtect password hashes of local users via manipulation of the HTML markup.
https://security.paloaltonetworks.com/CVE-2018-9334