The Goobi viewer is a web application that allows digitised material to be displayed in a web browser. From 4.8.0 to before 26.04.1, the Goobi viewer REST endpoint POST /api/v1/index/stream accepted an arbitrary Solr streaming expression from unauthenticated network clients and forwarded it to the backend Solr server without restriction. An attacker could read the complete Solr index and, in default Solr deployments, also modify or delete indexed records. This vulnerability is fixed in 26.04.1.
https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-2rgp-f66f-4499
https://github.com/intranda/goobi-viewer-core/commit/6bfb1cbd4250b0b347e84a80f38e8bf46acac705
https://github.com/intranda/goobi-viewer-core/commit/326980f24ce1e7cfabf658dd5f615934ca68ebbd