An authenticated user (using the auth_users plugin authentication method) could install a custom package even if this user is not superuser.
This is fixed in the version 2.2.15. Users should upgrade to this version as soon as possible.
2.2.15Exploitability
AV:NAC:LAT:NPR:LUI:NVulnerable System
VC:LVI:HVA:LSubsequent System
SC:LSI:LSA:L7.2/CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L