GeoServer has improper ENTITY_RESOLUTION_ALLOWLIST URI validation in XML Processing (SSRF)

published 2025-06-10 16 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-17669 , GHSA-mc43-4fqr-c965

cvss: 9.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits: 0; none known

GeoServer is an open source server that allows users to share and edit geospatial data. An improper URI validation vulnerability exists that enables an unauthorized attacker to perform XML External Entities (XEE) attack, then send GET request to any HTTP server. By default, GeoServer use PreventLocalEntityResolver class from GeoTools to filter out malicious URIs in XML entities before resolving them. The URI must match the regex (?i)(jar:file|http|vfs)[^?#;]*\\.xsd. But the regex leaves a chance for attackers to request to any HTTP server or limited file. Attacker can abuse this to scan internal networks and gain information about them then exploit further. GeoServer 2.25.0 and greater default to the use of ENTITY_RESOLUTION_ALLOWLIST and does not require you to provide a system property.

Patch / fix

fixed in 5

maven org.geoserver.web:gs-web-app 2.25.0
maven org.geoserver.main:gs-main 2.25.0
geoserver geoserver 2.25.0
org.geoserver gs-main 2.25.0
osgeo geoserver 2.25.0

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 16 mo ago (2025-06-10)

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
GitHub	3.1	9.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
NVD	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	org.geoserver.web:gs-web-app	<2.25.0	2.25.0
maven	org.geoserver.main:gs-main	<2.25.0	2.25.0

Affected products

geoserver geoserver

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-611 Improper Restriction of XML External Entity Reference
CWE-918 Server-Side Request Forgery
CWE-20 Improper Input Validation

References

github.com /geoserver/geoserver/security/advisories/GHSA-mc43-4fqr-c965
web, mitigation, third-party-advisory
docs.geoserver.org /latest/en/user/production/config.html#production-config-external-entities
web, product
nvd.nist.gov /vuln/detail/CVE-2024-34711
advisory
github.com /geoserver/geoserver
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary