GeoServer is an open source server that allows users to share and edit geospatial data. The Coverage rest api /workspaces/{workspaceName}/coveragestores/{storeName}/{method}.{format} allows attackers to upload files with a specified url (with {method} equals 'url') with no restrict. This vulnerability is fixed in 2.26.0.
https://osgeo-org.atlassian.net/browse/GEOS-11717
https://osgeo-org.atlassian.net/browse/GEOS-11468
https://github.com/geoserver/geoserver/security/advisories/GHSA-r4hf-r8gj-jgw2