CVE-2026-19596 (GCVE-0-2026-19596)
Vulnerability from cvelistv5
Published
2026-09-10 20:08
Modified
2026-09-10 20:27
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-611 - Improper Restriction of XML External Entity Reference
Summary
An XML External Entity (XXE) vulnerability exists in the XML collector of multiple versions of OpenNMS Meridian and Horizon. When OpenNMS collects XML from a source whose response is attacker-controlled (for example a compromised monitored host or an HTTP man-in-the-middle position), the collector's XML parser resolves external entities and external DTDs. This allows an attacker to read files accessible to the OpenNMS service account, including database credentials, and to induce out-of-band requests.
The solution is to upgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| The OpenNMS Group | Meridian |
Version: 2024.1.0 Version: 2025.0.0 |
|||||||
|
|||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-19596",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-10T20:27:39.274555Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-10T20:27:45.533Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Meridian",
"repo": "https://github.com/OpenNMS",
"vendor": "The OpenNMS Group",
"versions": [
{
"lessThan": "2024.3.13",
"status": "affected",
"version": "2024.1.0",
"versionType": "maven"
},
{
"lessThan": "2025.0.10",
"status": "affected",
"version": "2025.0.0",
"versionType": "maven"
}
]
},
{
"defaultStatus": "unaffected",
"product": "Horizon",
"repo": "https://github.com/OpenNMS",
"vendor": "The OpenNMS Group",
"versions": [
{
"lessThan": "36.0.4",
"status": "affected",
"version": "36.0.0",
"versionType": "maven"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Keith Lee, Foregenix"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn XML External Entity (XXE) vulnerability exists in the XML collector of multiple versions of OpenNMS Meridian and Horizon. When OpenNMS collects XML from a source whose response is attacker-controlled (for example a compromised monitored host or an HTTP man-in-the-middle position), the collector\u0027s XML parser resolves external entities and external DTDs. This allows an attacker to read files accessible to the OpenNMS service account, including database credentials, and to induce out-of-band requests.\u003c/p\u003e\u003cp\u003eThe solution is to upgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization\u0027s private networks and should not be directly accessible from the Internet.\u003c/p\u003e"
}
],
"value": "An XML External Entity (XXE) vulnerability exists in the XML collector of multiple versions of OpenNMS Meridian and Horizon. When OpenNMS collects XML from a source whose response is attacker-controlled (for example a compromised monitored host or an HTTP man-in-the-middle position), the collector\u0027s XML parser resolves external entities and external DTDs. This allows an attacker to read files accessible to the OpenNMS service account, including database credentials, and to induce out-of-band requests.\n\n\n\nThe solution is to upgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization\u0027s private networks and should not be directly accessible from the Internet."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-611",
"description": "CWE-611 Improper Restriction of XML External Entity Reference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-10T20:08:50.816Z",
"orgId": "70b007e9-5235-4ee5-90b5-a71a81beeda0",
"shortName": "OpenNMS"
},
"references": [
{
"tags": [
"patch"
],
"url": "https://github.com/OpenNMS/opennms/pull/8782"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eUpgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer.\u003c/p\u003e"
}
],
"value": "Upgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer."
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "OpenNMS XML collector XXE allows arbitrary file read from the OpenNMS host",
"x_generator": {
"engine": "Vulnogram 1.0.4"
}
}
},
"cveMetadata": {
"assignerOrgId": "70b007e9-5235-4ee5-90b5-a71a81beeda0",
"assignerShortName": "OpenNMS",
"cveId": "CVE-2026-19596",
"datePublished": "2026-09-10T20:08:50.816Z",
"dateReserved": "2026-08-12T06:24:26.987Z",
"dateUpdated": "2026-09-10T20:27:45.533Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-19596\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-10T20:27:39.274555Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-10T20:27:42.851Z\"}}], \"cna\": {\"title\": \"OpenNMS XML collector XXE allows arbitrary file read from the OpenNMS host\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Keith Lee, Foregenix\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://github.com/OpenNMS\", \"vendor\": \"The OpenNMS Group\", \"product\": \"Meridian\", \"versions\": [{\"status\": \"affected\", \"version\": \"2024.1.0\", \"lessThan\": \"2024.3.13\", \"versionType\": \"maven\"}, {\"status\": \"affected\", \"version\": \"2025.0.0\", \"lessThan\": \"2025.0.10\", \"versionType\": \"maven\"}], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://github.com/OpenNMS\", \"vendor\": \"The OpenNMS Group\", \"product\": \"Horizon\", \"versions\": [{\"status\": \"affected\", \"version\": \"36.0.0\", \"lessThan\": \"36.0.4\", \"versionType\": \"maven\"}], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eUpgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer.\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://github.com/OpenNMS/opennms/pull/8782\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.4\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"An XML External Entity (XXE) vulnerability exists in the XML collector of multiple versions of OpenNMS Meridian and Horizon. When OpenNMS collects XML from a source whose response is attacker-controlled (for example a compromised monitored host or an HTTP man-in-the-middle position), the collector\u0027s XML parser resolves external entities and external DTDs. This allows an attacker to read files accessible to the OpenNMS service account, including database credentials, and to induce out-of-band requests.\\n\\n\\n\\nThe solution is to upgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization\u0027s private networks and should not be directly accessible from the Internet.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eAn XML External Entity (XXE) vulnerability exists in the XML collector of multiple versions of OpenNMS Meridian and Horizon. When OpenNMS collects XML from a source whose response is attacker-controlled (for example a compromised monitored host or an HTTP man-in-the-middle position), the collector\u0027s XML parser resolves external entities and external DTDs. This allows an attacker to read files accessible to the OpenNMS service account, including database credentials, and to induce out-of-band requests.\u003c/p\u003e\u003cp\u003eThe solution is to upgrade to Meridian 2024.3.13, 2025.0.10 and Horizon 36.0.4 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization\u0027s private networks and should not be directly accessible from the Internet.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-611\", \"description\": \"CWE-611 Improper Restriction of XML External Entity Reference\"}]}], \"providerMetadata\": {\"orgId\": \"70b007e9-5235-4ee5-90b5-a71a81beeda0\", \"shortName\": \"OpenNMS\", \"dateUpdated\": \"2026-09-10T20:08:50.816Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-19596\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-10T20:27:45.533Z\", \"dateReserved\": \"2026-08-12T06:24:26.987Z\", \"assignerOrgId\": \"70b007e9-5235-4ee5-90b5-a71a81beeda0\", \"datePublished\": \"2026-09-10T20:08:50.816Z\", \"assignerShortName\": \"OpenNMS\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…