affects OMERO.server 5 versions 5.6.0 and earlier
OMERO.server uses Hibernate Filters to protect sensitive data but it is possible to craft a query that can access some data indirectly.
Some objects are hidden from normal users for security reasons. The OMERO.blitz API allows users to query the server for data. One may bypass the security filters by making those queries in an obscure manner.
OMERO 5.6.1 uses custom types to effect the hiding of sensitive fields. These take effect regardless of how the field was queried.
This vulnerability is identified as CVE-2019-16244.
OMERO.server before 5.6.1.
All OMERO.servers should be upgraded to at least 5.6.1.