LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf_name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrary JavaScript through SNMP responses that executes in the browser of any user viewing VRF-related pages.
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Fixes

Solution

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Workaround

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History

Tue, 01 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
Description LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf_name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrary JavaScript through SNMP responses that executes in the browser of any user viewing VRF-related pages.
Title LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields
First Time appeared Librenms
Librenms librenms
Weaknesses CWE-79
CPEs cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:*
Vendors & Products Librenms
Librenms librenms
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-01T14:56:16.717Z

Reserved: 2026-09-01T10:51:59.729Z

Link: CVE-2026-84191

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-01T12:17:48.587

Modified: 2026-09-01T15:17:43.487

Link: CVE-2026-84191

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T13:15:05Z

Weaknesses