An improper access check allows user to download vcard exports of com_contact contacts that are inaccessible.
Exploitability
AV:NAC:LAT:NPR:HUI:NVulnerable System
VC:LVI:NVA:NSubsequent System
SC:HSI:HSA:H6.4/CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:HConfiguration