Medium
LibreNMS has Stored XSS in Alert Rule
Type: advisorySources: OSV
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are affected by a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Rules workflow. An attacker with administrative privileges can inject malicious scripts that execute in the browser context of any user who accesses the Alert Rules page. This issue has been fixed in version 26.2.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-26989
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 15:28 UTC · Revision 1
Source evidence
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are affected by a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Rules workflow. An attacker with administrative privileges can inject malicious scripts that execute in the browser context of any user who accesses the Alert Rules page. This issue has been fixed in version 26.2.0.
osv:CVE-2026-26989
Complete source record
{
"id": "e1d5db25f8fee7e8510c687cbd99d83f40b59052c72ca53aaf0ff30ec1d2be9b",
"url": "https://osv.dev/vulnerability/CVE-2026-26989",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "LibreNMS has Stored XSS in Alert Rule",
"summary": "LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are affected by a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Rules workflow. An attacker with administrative privileges can inject malicious scripts that execute in the browser context of any user who accesses the Alert Rules page. This issue has been fixed in version 26.2.0.",
"evidence": "osv:CVE-2026-26989",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-26989",
"aliases": [
"CVE-2026-26989",
"GHSA-6xmx-xr9p-58p7"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/librenms/librenms",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "eeaa05618c22140d087739097b217800b0d6621f"
},
{
"fixed": "087608cf9f851189847cb8e8e5ad002e59170c58"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "26.2.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "087608cf9f851189847cb8e8e5ad002e59170c58"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "eeaa05618c22140d087739097b217800b0d6621f"
}
],
"source": "REFERENCES_TAG",
"original_tag": "26.2.0"
}
]
}
}
],
"versions": [
"26.1.0",
"25.12.0",
"25.11.0",
"25.10.0",
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"23.8.0",
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"1.69",
"1.68",
"1.67",
"1.66",
"1.65",
"1.64.1",
"1.64",
"1.63",
"1.62",
"1.61",
"1.60",
"1.59",
"1.58.1",
"1.58",
"1.57",
"1.56",
"1.55",
"1.54",
"1.53.1",
"1.53",
"1.52",
"1.51",
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"1.31.02",
"1.31.01",
"1.28",
"1.27",
"1.26",
"1.25",
"1.21",
"201609",
"1.20",
"20160828",
"1.19",
"201608",
"201607",
"201606",
"201605",
"201604",
"201603",
"201602",
"201601",
"201512",
"201511",
"201510",
"201509",
"201508",
"201507",
"201505",
"201506",
"0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26989.json"
}
}
],
"modified": "2026-10-28T02:30:20.618734157Z",
"provider": "osv",
"references": [
"https://github.com/librenms/librenms/releases/tag/26.2.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26989.json",
"https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7",
"https://nvd.nist.gov/vuln/detail/CVE-2026-26989",
"https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58",
"https://github.com/librenms/librenms/pull/19039"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26989.json"
}
},
"related_cves": [
{
"value": "CVE-2026-26989",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 486524,
"published_at": "2026-02-20T01:25:31.936+00:00"
}