OMERO.web provides a web based client and plugin infrastructure. In versions prior to 5.11.0, a variety of templates do not perform proper sanitization through HTML escaping. Due to the lack of sanitization and use of ``jQuery.html()``, there are a whole host of cross-site scripting possibilities with specially crafted input to a variety of fields. This issue is patched in version 5.11.0. There are no known workarounds aside from upgrading.
https://www.openmicroscopy.org/security/advisories/2021-SV3/
https://github.com/ome/omero-web/security/advisories/GHSA-g67g-hvc3-xmvf
https://github.com/ome/omero-web/commit/0168067accde5e635341b3c714b1d53ae92ba424