CVE-2026-84192
LibreNMS before 26.3.1 Stored XSS via SNMP/Syslog Data
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 1, 2026
- Updated
- Oct 8, 2026
- Reserved
- Sep 1, 2026
Description
LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in legacy PHP templates that output SNMP-sourced and syslog-sourced data without escaping. An attacker who controls a monitored network device can inject arbitrary JavaScript through SNMP interface descriptions or syslog program fields that executes when authenticated users view affected pages.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.1 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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-7w8c-qgxg-m7jx)vendor-advisory
- VulnCheck Advisory: LibreNMS before 26.3.1 Stored XSS via SNMP/Syslog Datathird-party-advisory
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