CVE-2026-58400

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.2%, top 34% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

GeoNetwork is a catalog application to manage spatially referenced resources. Prior to versions 4.4.12 and 4.2.17, the Saxon XSLT processor used to render formatters is configured without secure processing (FEATURE_SECURE_PROCESSING) and without disabling Java extension functions (ALLOW_EXTERNAL_FUNCTIONS). Any stylesheet loaded by GeoNetwork can therefore invoke java.lang.Runtime.exec() or java.lang.ProcessBuilder directly, achieving arbitrary command execution as the GeoNetwork process user. A user with sufficient privileges to upload a formatter can deliver a .xsl file containing Java extension call that execute arbitrary OS commands with the privileges of the GeoNetwork process. The issue is patched in GeoNetwork versions 4.4.12 and 4.2.17.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
66%
KEV
Not listed

Published

September 3, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Sep 15, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github.
generic🔴 Active Exploitation

GeoNetwork Fixes Unauthenticated RCE Chain Affecting Government Geoportal Backends

https://thehackernews.com/2026/09/geonetwork-fixes-unauthenticated-rce.html
github Patch Available

Remote Code Execution via unsafe Saxon XSLT processor configuration in formatter · Advisory · geonetwork/core-geonetwork · GitHub

https://github.com/geonetwork/core-geonetwork/security/advisories/GHSA-x898-729x-cc3r
generic

Version 4.4.12 - GeoNetwork opensource

https://docs.geonetwork-opensource.org/4.4/overview/change-log/version-4.4.12
generic

Version 4.2.17 - GeoNetwork opensource (EN)

https://docs.geonetwork-opensource.org/4.2/overview/change-log/version-4.2.17

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 23:00 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 20:34 UTCEG score recompute
  4. 2026-09-17 19:31 UTCEPSS rescore
  5. 2026-09-16 18:34 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 05:37 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 06:20 UTCEG score recompute
  10. 2026-09-15 03:11 UTCEPSS rescore
  11. 2026-09-13 20:28 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescore
  13. 2026-09-12 18:08 UTCEG score recompute
  14. 2026-09-11 15:31 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 11:45 UTCEG score recompute
  17. 2026-09-10 12:16 UTCEG score recompute
  18. 2026-09-10 09:35 UTCEPSS rescore
  19. 2026-09-08 23:06 UTCEG score recompute
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-07 18:35 UTCEG score recompute
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-06 15:21 UTCEG score recompute
  24. 2026-09-06 13:47 UTCEPSS rescore
  25. 2026-09-05 16:46 UTCEG score recompute
Show 5 more
  1. 2026-09-04 14:21 UTCEG score recompute
  2. 2026-09-04 13:46 UTCEG score recompute
  3. 2026-09-03 18:40 UTCEG score recompute
  4. 2026-09-03 17:25 UTCEG score recompute
  5. 2026-09-03 17:23 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-58400?
CVE-2026-58400 is a critical vulnerability published on September 3, 2026. GeoNetwork is a catalog application to manage spatially referenced resources. Prior to versions 4.4.12 and 4.2.17, the Saxon XSLT processor used to render formatters is configured without secure processing (FEATURESECUREPROCESSING) and without disabling Java extension functions…
When was CVE-2026-58400 disclosed?
CVE-2026-58400 was first published in the National Vulnerability Database on September 3, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58400 actively exploited?
CVE-2026-58400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 33.5% of all scored CVEs.
What is the CVSS score of CVE-2026-58400?
CVE-2026-58400 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-58400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58400, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-58400

Explore →

Is Your Infrastructure Affected by CVE-2026-58400?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs