CVE-2025-27505: geoserver Auth Bypass — Fix

Description

GeoServer is an open source server that allows users to share and edit geospatial data. It is possible to bypass the default REST API security and access the index page. The REST API security handles rest and its subpaths but not rest with an extension (e.g., rest.html). The REST API index can disclose whether certain extensions are installed. This vulnerability is fixed in 2.26.3 and 2.25.6. As a workaround, in ${GEOSERVER_DATA_DIR}/security/config.xml, change the paths for the rest filter to /rest.*,/rest/** and change the paths for the gwc filter to /gwc/rest.*,/gwc/rest/** and restart GeoServer.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-862 Missing Authorization

Affected Products

Vendor	Product	Versions
osgeo	geoserver	< 2.25.6
osgeo	geoserver	2.26.0 — 2.26.3

References

Advisories & Patches

https://github.com/geoserver/geoserver/pull/8170 https://osgeo-org.atlassian.net/browse/GEOS-11664

Other References

https://github.com/geoserver/geoserver/security/advisories/GHSA-h86g-x8mm-78m5 https://osgeo-org.atlassian.net/browse/GEOS-11776

Frequently Asked Questions

What is CVE-2025-27505? +

GeoServer is an open source server that allows users to share and edit geospatial data. It is possible to bypass the default REST API security and access the index page. The REST API security handles rest and its subpaths but not rest with an extension (e.g., rest.html). The REST API index can disclose whether certain extensions are installed. This vulnerability is fixed in 2.26.3 and 2.25.6. As a workaround, in ${GEOSERVER_DATA_DIR}/security/config.xml, change the paths for the rest filter to /rest.*,/rest/** and change the paths for the gwc filter to /gwc/rest.*,/gwc/rest/** and restart GeoServer. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-27505? +

CVE-2025-27505 has a CVSS v3.1 score of 5.3 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-2025-27505? +

CVE-2025-27505 affects products from osgeo, specifically: geoserver. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27505? +

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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