CVE-2026-55864 GeoNetwork: Unauthenticaded Server-Side Request Forgery in SLD Tool
An anonymous attacker can exploit an SSRF vulnerability in the SLD tool to access internal network resources and disclose sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55864?
CVE-2026-55864 is a high-severity server-side request forgery vulnerability in core-geonetwork, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
GeoNetwork is a catalog application to manage spatially referenced resources. Prior to 4.2.17 and 4.4.12, POST /api/tools/ogc/sld accepted a caller-supplied WMS server URL and performed a server-side HTTP GET without destination validation. An anonymous attacker could make the GeoNetwork server send requests to internal hosts that are not publicly reachable. When the outbound response was XML, the endpoint could store and return the fetched body, making the request forgery non-blind and enabling internal data disclosure, authorization bypass, and network reconnaissance. This issue is fixed in versions 4.2.17 and 4.4.12.
Weakness: CWE-918
Which versions are affected by CVE-2026-55864?
4 open source packages ship an affected version, including org.geonetwork-opensource:gn-web-app.
| Package | Affected | Fixed in |
|---|---|---|
org.geonetwork-opensource:gn-web-app Maven | From 4.0.0 | 4.2.17 |
org.geonetwork-opensource:gn-web-app Maven | From 4.0.0 | 4.2.17 |
org.geonetwork-opensource:gn-web-app Maven | From 4.4.0 | 4.4.12 |
org.geonetwork-opensource:gn-web-app Maven | From 4.4.0 | 4.4.12 |
How do I fix CVE-2026-55864?
Upgrade org.geonetwork-opensource:gn-web-app to a fixed version for your release line: 4.2.17 or 4.4.12.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-55864 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55864 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-5hx7-j24v-rffj.