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GHSA-wf6j-gr27-g7ch

HighCVSS 7.2 / 10
Published Aug 19, 2026·Last modified Aug 19, 2026
Affected Components(3)
Maven logoorg.geoserver/gs-main
< 2.27.0
Maven logoorg.geoserver/gs-wms
< 2.27.0
Maven logoorg.geoserver.web/gs-web-app
< 2.27.0
Description

Summary

A server-side template injection (SSTI) vulnerability exist that allows an authenticated administrator to upload FreeMarker templates containing malicious content that can execute OS commands and read from or write to arbitrary files on the server. These FreeMarker templates are used in a plain GeoServer instance (no extension or community modules) for WMS GetFeatureInfo HTML and JSON and WMS GetMap KML and GeoRSS output formats.

Details

The org.geoserver.template.TemplateUtils.getSafeConfiguration() method attempts to block access to the class freemarker.template.utility.Execute but it is still possible to gain access to it and other sensitive functionality by chaining a specific sequence of method calls.

Impact

This vulnerability can lead to executing arbitrary code and reading and writing arbitrary files.

Resolution

GeoServer 2.27.0 addresses this vulnerability with several new application properties:

  • GEOSERVER_FREEMARKER_BLOCK_LIST
  • GEOSERVER_FREEMARKER_ALLOW_LIST
  • GEOSERVER_FREEMARKER_API_EXPOSED

These application properties default to restricting the objects template authors can access, and limit access to "getter" methods used to access object properties.

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Risk Scores
Base Score
7.2

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
6.6

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2024-45747
    Alias

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