Onyx is an open-source AI platform. Prior to 4.3.0, Onyx Enterprise Edition's PATCH /manage/admin/user-group/{usergroupid} and POST /manage/admin/user-group/{usergroupid}/add-users endpoints in ee/onyx/server/usergroup/api.py call updateusergroup and adduserstousergroup in ee/onyx/db/usergroup.py without enforcing validatecuratorcanmodifygroup, allowing a curator to add accounts to arbitrary groups and obtain document access through getaclforuser and the OpenSearch accesscontrollist filter. This issue is fixed in version 4.3.0.