Galaxy is a free, open-source system for analyzing data, authoring workflows, training and education, publishing tools, managing infrastructure, and more. The editor visualization, /visualizations endpoint, can be used to store HTML tags and trigger javascript execution upon edit operation. All supported branches of Galaxy (and more back to release_20.05) were amended with the supplied patches. Users are advised to upgrade. There are no known workarounds for this vulnerability.
https://github.com/galaxyproject/galaxy/security/advisories/GHSA-x6w7-3gwf-qr9r