Answer in brief
CVE-2026-55864 records a High severity vulnerability in GeoNetwork Web Module: Unauthenticaded Server-Side Request Forgery in SLD Tool. The current sources do not mark it as known exploited. The current feed maps org.geonetwork-opensource:gn-web-app (maven), org.geonetwork-opensource:gn-web-app (maven), org.geonetwork-opensource:gn-web-app (maven), org.geonetwork-opensource:gn-web-app (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps org.geonetwork-opensource:gn-web-app (maven), org.geonetwork-opensource:gn-web-app (maven), org.geonetwork-opensource:gn-web-app (maven), org.geonetwork-opensource:gn-web-app (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| org.geonetwork-opensource:gn-web-appmaven | >=4.4.0,<=4.4.11 | 4.4.12 |
| org.geonetwork-opensource:gn-web-appmaven | >=4.0.0,<=4.2.16 | 4.2.17 |
| org.geonetwork-opensource:gn-web-appmaven | >=4.4.0 <4.4.12 | 4.4.12 |
| org.geonetwork-opensource:gn-web-appmaven | >=4.0.0 <4.2.17 | 4.2.17 |
Published upstream
Sep 9, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Sep 9, 2026
### Summary An unauthenticated server-side request forgery vulnerability lets any anonymous user make the GeoNetwork server issue arbitrary outbound HTTP requests. This gives an external attacker a position inside the server's network, making it possible to make internal requests no matter if the response is XML-type or not. The SLD tooling endpoint `POST /api/tools/ogc/sld` takes a caller-supplied **WMS server URL** and performs a **server-side HTTP GET** to it, with no validation. The fetched body can also be stored and downloaded if the output of the outbound request is in XML format, making the SSRF non-blind. ### Impact Any unauthenticated user can make the server send arbitrary HTTP requests to internal hosts it would never expose publicly, and read the responses back if the request responses are XML. This enables internal data disclosure, for example, configuration files that return as XML, authorization bypass, and reconnaissance of the internal network all from an anonymous position. ### Resolution Patched releases: * 4.4.12 * 4.2.17 ### Resources * https://github.com/geonetwork/core-geonetwork/pull/9343
Quoted source text, attributed separately from HOL analysis.