CVE-2026-84191
LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Reserved
- Sep 1, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
librenmslibrenms |
|
References
- GitHub Security Advisory (GHSA-g993-wffj-m3gv)vendor-advisory
- VulnCheck Advisory: LibreNMS before 26.5.0 Stored XSS via SNMP VRF fieldsthird-party-advisory
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