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Advisory record · GHSA-mc43-4fqr-c965

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

CVSS 9.3 CriticalCriticalEPSS 0.0031 · 24th percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 10 Jun 2025, 14:13 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.geoserver.web:gs-web-appMaven<2.25.02.25.0
org.geoserver.main:gs-mainMaven<2.25.02.25.0
Identifiers
GHSA-mc43-4fqr-c965 · CVE-2024-34711
Weakness (CWE)
CWE-20 · CWE-200 · CWE-611 · CWE-918
Tags
Published
10 Jun 2025
Updated
10 Jun 2025

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

GeoServer (org.geoserver.web:gs-web-app and org.geoserver.main:gs-main) before 2.25.0 has improper URI validation in its XML external entity filtering. An unauthenticated attacker can exploit this XXE flaw to make server-side requests to arbitrary HTTP servers, scan internal networks, and read limited .xsd files. Upgrade to 2.25.0 or later, which uses an allowlist by default; the source also notes that the ENTITY_RESOLUTION_ALLOWLIST system property can add schema locations.

Written 7 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0031, the 24th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:11 UTC First seen by agentprime
  2. 31 Oct 2026, 15:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.