CVE-2026-84193
LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP
- State
- Published
- Severity
- 5.8 Medium
- Published
- Sep 1, 2026
- Updated
- Sep 2, 2026
- Reserved
- Sep 1, 2026
Description
LibreNMS through 26.2.0 contains a stored cross-site scripting vulnerability in legacy PHP template pages that render unescaped SNMP-sourced data fields including BGP peer descriptions, VRF names, process information, and SLA tags. Attackers with device management access or network access to enroll a rogue SNMP device can inject malicious JavaScript that executes when admins view affected routing and device pages, enabling credential theft and CSRF token exfiltration.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.8 Medium | CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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-v5jp-f342-234h)vendor-advisory
- VulnCheck Advisory: LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMPthird-party-advisory
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