Versions of the npm CLI prior to 6.13.3 are vulnerable to an Arbitrary File Write. It fails to prevent access to folders outside of the intended node_modules folder through the bin field. A properly constructed entry in the package.json bin field would allow a package publisher to modify and/or gain access to arbitrary files on a user's system when the package is installed. This behavior is still possible through install scripts. This vulnerability bypasses a user using the --ignore-scripts install option.
Exploitability
AV:NAC:HPR:LUI:RScope
S:CImpact
C:HI:HA:N7.7/CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:NInput Validation