Is CVE-2026-84191 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-84191?

CVE-2026-84191 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-84191

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.