CVE-2023-40612

Authenticated file disclosure via external XML entities

Published Aug 23, 2023 · Updated Oct 1, 2024

XXE in the OpenNMS file editor allows remote authenticated users to read files in affected Horizon and Meridian releases. FilesystemRestService.maybeValidateXml parses edited XML without disabling external general entities, parameter entities, or external DTD loading. ROLE_FILESYSTEM_EDITOR access is required, and crafted XML can make the server read local data and transmit it through an outbound request.

CVSS severity5.3
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in the OpenNMS file editor allows remote authenticated users to read files in affected Horizon and Meridian releases. FilesystemRestService.maybeValidateXml parses edited XML without disabling external general entities, parameter entities, or external DTD loading. ROLE_FILESYSTEM_EDITOR access is required, and crafted XML can make the server read local data and transmit it through an outbound request.

The record

CVE
CVE-2023-40612
Published
Aug 23, 2023
Updated
Oct 1, 2024
Vendor
The OpenNMS Group, Inc.
Product
OpenNMS Meridian
Classifications
CWE-91, CAPEC-201, T1005, T1048.003
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2024Record 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=2023.0.0 <2023.1.5

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

The OpenNMS Group, Inc. · OpenNMS Meridianversion=2023.0.0 <2023.1.5
The OpenNMS Group, Inc. · OpenNMS Horizonversion=31.0.8 <32.0.2

Published CVSS scores

5.3The OpenNMS GroupCVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:L
8.0NIST NVDCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-91XML Injection (aka Blind XPath Injection)
CAPEC-201XML Entity Linking
T1005Data from Local System
T1048.003Exfiltration Over Unencrypted Non-C2 Protocol

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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