What is CVE-2025-21621?

CVE-2025-21621 is a medium-severity vulnerability in Geoserver, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-11-25.

How severe is CVE-2025-21621?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Geoserver

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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (10.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Geoserver — versions < 2.25.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2025-21621?: CVE-2025-21621 is a medium-severity vulnerability in Geoserver, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-11-25.
How severe is CVE-2025-21621?: Medium severity. CVSS v3 base score is 6.1 out of 10.