CVE-2026-55864Network attack vectorHinoki check available

Internal XML disclosure via unchecked WMS URL

Published Sep 15, 2026 · Updated Sep 15, 2026

SSRF in GeoNetwork opensource 4.0.0 through 4.2.16 and 4.4.0 through 4.4.11 allows remote attackers to read internal XML data. The unauthenticated POST /api/tools/ogc/sld endpoint accepts a caller-supplied WMS server URL, performs a server-side HTTP GET without destination validation, and stores and returns XML response bodies. Anonymous network access is sufficient; non-XML targets remain reachable for internal requests and reconnaissance, but their response bodies are not returned.

CVSS severity7.7
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in GeoNetwork opensource 4.0.0 through 4.2.16 and 4.4.0 through 4.4.11 allows remote attackers to read internal XML data. The unauthenticated POST /api/tools/ogc/sld endpoint accepts a caller-supplied WMS server URL, performs a server-side HTTP GET without destination validation, and stores and returns XML response bodies. Anonymous network access is sufficient; non-XML targets remain reachable for internal requests and reconnaissance, but their response bodies are not returned.

The record

CVE
CVE-2026-55864
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
GeoNetwork
Product
GeoNetwork opensource
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.0.0, < 4.2.17
  2. Affected versionversion=>= 4.4.0, < 4.4.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GeoNetwork · GeoNetwork opensourceversion=>= 4.0.0, < 4.2.17; version=>= 4.4.0, < 4.4.12

Published CVSS scores

7.7GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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