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EUVD-2026-328547

fkie_cve-2025-58175

GeoServer is an open source server that allows users to share and edit geospatial data. Prior to versions 2.26.4 and 2.27.3, a GeoServer that uses `ENTITY_RESOLUTION_ALLOWLIST` may allow attacker to perform unauthenticated Server-Side Request Forgery (SSRF). This vulnerability requires that GeoServer is set up to use a proxy base URL and the `ENTITY_RESOLUTION_ALLOWLIST` (default since 2.25.0). Versions 2.26.4 and 2.27.3 contain a fix. GeoServer installations are only affected by this vulnerability if they use a proxy base URL that does not contain a URL path or end with a slash. If the proxy base URL does not contain a path, adding a slash to the end of the URL will mitigate this vulnerability.

GHSA-x4r9-gmw3-hxww — GeoServer has a Server-Side Request Forgery (SSRF) Vulnerability in its XML Entity Resolution

Affected: Maven: org.geoserver.web:gs-web-app, Maven: org.geoserver:gs-main

### Summary A GeoServer that uses `ENTITY_RESOLUTION_ALLOWLIST` may allow attacker to perform unauthenticated Server-Side Request Forgery (SSRF).

### Details This vulnerability requires that GeoServer is set up to use a proxy base URL and the `ENTITY_RESOLUTION_ALLOWLIST` (default since 2.25.0):

### Impact This vulnerability allows an attacker to cause GeoServer to make requests to an unintended location.

### Workaround GeoServer installations are only affected by this vulnerability if they use a proxy base URL that does not contain a URL path or end with a slash (e.g., `https://somesite.org` instead of `https://somesite.org/` or `https://somesite.org/geoserver`). If the proxy base URL does not contain a path, adding a slash to the end of the URL will mitigate this vulnerability.

### Resources https://osgeo-org.atlassian.net/browse/GEOS-11867 https://github.com/geoserver/geoserver/pull/8622

### Credits: - Le Mau Anh Phong at Verichains Cyber Force

WID-SEC-W-2026-1902 — GeoServer: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in GeoServer ausnutzen, um beliebigen Programmcode auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.