CVE-2025-21621: geoserver XSS — Fix

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.

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CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
geoserver	geoserver	< 2.25.0

References

Advisories & Patches

https://github.com/geoserver/geoserver/commit/dc9ff1c726dd73c884437a123b4ad72b19383c7d https://github.com/geoserver/geoserver/security/advisories/GHSA-w66h-j855-qr72

Other References

https://github.com/geoserver/geoserver/pull/7406 https://osgeo-org.atlassian.net/browse/GEOS-11297

Frequently Asked Questions

What is CVE-2025-21621? +

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. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-21621? +

CVE-2025-21621 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-21621? +

CVE-2025-21621 affects products from geoserver, specifically: geoserver. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21621? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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