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Advisory record · GHSA-fjf5-xgmq-5525

GeoServer is vulnerable to Unauthenticated XML External Entities (XXE) attack via WMS GetMap feature

CVSS 8.2 HighCriticalIn CISA KEVEPSS 0.61 · 99th percentile

Critical, because:

  • In CISA’s KEV catalogue since 11 Dec 2025: it is known to be exploited.
  • CVSS score 8.2 (7.0 or more) and EPSS 0.61 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 25 Nov 2025, 19:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.geoserver.web:gs-web-appMaven>=2.26.0, <2.26.2 || <2.25.62.26.2, 2.25.6
org.geoserver:gs-wmsMaven>=2.26.0, <2.26.2 || <2.25.62.26.2, 2.25.6
Identifiers
GHSA-fjf5-xgmq-5525 · CVE-2025-58360
Weakness (CWE)
CWE-611
Tags
Published
25 Nov 2025
Updated
11 Dec 2025

Machine-written summary

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

GeoServer (packages gs-web-app and gs-wms) versions 2.26.0 up to 2.26.2 and versions before 2.25.6 are affected. The WMS GetMap operation accepts XML input without adequate restriction on external entities, so an unauthenticated attacker can send a crafted request to read arbitrary files from the server, perform server-side request forgery against internal systems, or cause denial of service. Upgrade to 2.25.6 or 2.26.3 or later; the source lists 2.26.2 as a fixed version for these packages but its resolution names 2.26.3 and 2.27.0.

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
8.2 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L CNA (GitHub_M)
  • CISA KEV Listed since 11 Dec 2025: known to be exploited.
  • EPSS 0.61, the 99th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:09 UTC First seen by agentprime
  2. 31 Oct 2026, 15:09 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.