CVE-2025-21621: GeoServer has a Reflected Cross-Site Scripting (XSS) vulnerability in its WMS GetFeatureInfo HTML format

CVE-2025-21621 · Severity: medium · CVSS 6.1 · Published 2025-11-25

GeoServer is an open source server that allows users to share and edit geospatial data. Prior to version 2.25.0, a reflected cross-site scripting (XSS) vulnerability exists in the WMS GetFeatureInfo HTML output format that enables a remote attacker to execute arbitrary JavaScript code in a victim's browser through specially crafted SLD_BODY parameters. This issue has been patched in version 2.25.0.

Technologies: Geoserver, org.geoserver:gs-wms (Maven), org.geoserver.web:gs-web-app (Maven). Vendors: GeoServer, Maven.

Quick answers

Is CVE-2025-21621 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-21621 being exploited in the wild.
How severe is CVE-2025-21621?
Medium severity, with a CVSS score of 6.1, published 25 November 2025.
Which products and versions are affected?
org.geoserver:gs-wms (Maven) ECOSYSTEM:introduced=0,fixed=2.25.0; org.geoserver.web:gs-web-app (Maven) ECOSYSTEM:introduced=0,fixed=2.25.0.
Is there a fix for CVE-2025-21621?
Yes. org.geoserver:gs-wms (Maven): upgrade to 2.25.0 or later; org.geoserver.web:gs-web-app (Maven): upgrade to 2.25.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-21621?
Check whether you run Geoserver, org.geoserver:gs-wms (Maven) or org.geoserver.web:gs-web-app (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.geoserver:gs-wms (Maven): upgrade to 2.25.0 or later
    # set org.geoserver:gs-wms to 2.25.0 in your pom.xml or build.gradle
  • org.geoserver.web:gs-web-app (Maven): upgrade to 2.25.0 or later
    # set org.geoserver.web:gs-web-app to 2.25.0 in your pom.xml or build.gradle

Affected products

  • Geoserver
  • org.geoserver:gs-wms (Maven) ECOSYSTEM:introduced=0,fixed=2.25.0
  • org.geoserver.web:gs-web-app (Maven) ECOSYSTEM:introduced=0,fixed=2.25.0

Identifiers

  • CVE-2025-21621
  • GHSA-w66h-j855-qr72

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