CVE-2026-84193CWE-79cross-site-scripting

CVE-2026-84193

published September 1, 2026

CVSS
5.8
EPSS
0%
Percentile
27.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
5.8 · NONE
CVSS v4.0
5.8 · 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
EPSS
0.00349 · 27.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-01T16:17Z
References (3)
https://github.com/librenms/librenms/security/advisories/GHSA-v5jp-f342-234h · [email protected]https://www.vulncheck.com/advisories/librenms-through-26.2.0-stored-cross-site-scripting-via-snmp · [email protected]https://github.com/librenms/librenms/security/advisories/GHSA-v5jp-f342-234h · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 03 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 01 SEP 11:33Z
    LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP
    cvelistv5