GeoServer has a Server-Side Request Forgery (SSRF) Vulnerability in its XML Entity Resolution
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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.geoserver:gs-main | < 2.26.4, >= 2.27.0, < 2.27.3 | 2.26.4, 2.27.3 |
| Java / Kotlin (Maven) | org.geoserver.web:gs-web-app | < 2.26.4, >= 2.27.0, < 2.27.3 | 2.26.4, 2.27.3 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L- Weakness (CWE)
CWE-20, CWE-611, CWE-918- Platform
- Java / Kotlin (Maven)
- Package
org.geoserver:gs-main, org.geoserver.web:gs-web-app- Disclosed
- 12.06.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-x4r9-gmw3-hxww - CC BY 4.0
Vulnerability history: org.geoserver:gs-main
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 04.2022 08.2026
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 3
Disclosures per year
- 2022: 2
- 2023: 0
- 2024: 3
- 2025: 0
- 2026: 2
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GeoServer has a Server-Side Request Forgery (SSRF) Vulnerability in its XML Entity Resolution this entry
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