CVE-2026-55864
GeoNetwork Server-Side Request Forgery
Description
### 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
INFO
Published Date :
Sept. 9, 2026, 11:43 p.m.
Last Modified :
Sept. 9, 2026, 11:43 p.m.
Remotely Exploit :
No
Source :
github-security-advisories
Affected Products
The following products are affected by CVE-2026-55864
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update GeoNetwork to version 4.4.12 or 4.2.17.
- Apply vendor patches for the SLD tooling endpoint.
- Validate all user-supplied URLs rigorously.
- Restrict outgoing HTTP requests from the server.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55864.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55864 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55864
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55864 vulnerability anywhere in the article.