Medium severity · published Sep 1, 2026
CVE-2026-84191
LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields
6.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
librenms · librenms
before 26.5.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84191
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84191
github.com
https://github.com/librenms/librenms/security/advisories/GHSA-g993-wffj-m3gv
www.vulncheck.com
https://www.vulncheck.com/advisories/librenms-before-26.5.0-stored-xss-via-snmp-vrf-fields
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