Incorrect privileges management and insufficient path filtering allow to read arbitrary file on the server via the cpdavd attachment download endpoints.
Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:HI:LA:L8.6/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:LConfiguration