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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
librenms librenms unaffected
Version Status Constraints
0 affected < 26.5.0
26.5.0 unaffected —

No data.

No data.

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Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/librenms/librenms/security/advisories/GHSA-g993-wffj-m3gv cve-icon cve-icon
https://www.vulncheck.com/advisories/librenms-before-26.5.0-stored-xss-via-snmp-vrf-fields cve-icon cve-icon
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: 2026-09-01T11:33:55.836Z

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: 2026-09-01T12:17:48.587

Link: CVE-2026-84191

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T12:30:04Z

Weaknesses