CVE-2026-55864
Received Received - Intake

Server-Side Request Forgery in GeoNetwork

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: GitHub, Inc.

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.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-55864
EUVD
EUVD-2026-78675

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
geonetwork geonetwork to 4.2.17 (inc)
geonetwork geonetwork to 4.4.12 (inc)
geonetwork geonetwork From 4.0.0 (inc) to 4.4.12 (exc)
geonetwork geonetwork From 4.0.0 (inc) to 4.2.17 (exc)
geonetwork geonetwork to 4.4.12 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

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Executive Summary

This vulnerability in GeoNetwork allows an anonymous attacker to make the server send HTTP requests to internal hosts by supplying a malicious WMS server URL. The server performs a server-side GET request without validating the destination. If the response is XML, the endpoint may store and return the fetched data, enabling non-blind request forgery.

Detection Guidance

Check GeoNetwork server logs for unusual outbound HTTP requests to internal hosts. Monitor network traffic for unexpected connections from the GeoNetwork process to internal IP ranges. Verify if the server is running versions prior to 4.2.17 or 4.4.12.

Impact Analysis

This vulnerability could lead to internal data disclosure, authorization bypass, and network reconnaissance. Attackers may access sensitive internal resources, bypass security controls, or map internal network structures by exploiting the server to fetch and return data from internal hosts.

Compliance Impact

This vulnerability could violate GDPR by exposing personal data through internal data disclosure. For HIPAA, unauthorized access to internal systems may compromise protected health information. Compliance failures may result from unauthorized data access or breaches of confidentiality requirements.

Mitigation Strategies

Upgrade GeoNetwork to version 4.2.17 or 4.4.12 or later immediately. Restrict outbound network access for the GeoNetwork server to prevent unauthorized requests. Review and audit all recent network activity involving the server.

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