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Advisory record · GHSA-7w8c-qgxg-m7jx

LibreNMS — Stored XSS via SNMP/Syslog Data in Legacy Templates

CVSS 7.1 HighEPSS 0.0033 · 26th percentile

Published by the GitHub Advisory Database at 26 Aug 2026, 18:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
librenms/librenmsPackagist<26.5.026.5.0
Identifiers
GHSA-7w8c-qgxg-m7jx · CVE-2026-84192 · PKSA-pcg8-3qh7-w8k9
Weakness (CWE)
CWE-79
Tags
Published
26 Aug 2026
Updated
2 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

LibreNMS versions before 26.5.0 contain a stored cross-site scripting flaw in several legacy PHP template files, where SNMP-sourced and syslog-sourced values (such as port descriptions and syslog program names) are output into HTML without escaping. An attacker who controls a monitored network device, through a compromised SNMP agent or a syslog sender, can inject JavaScript that runs in the browser of any authenticated LibreNMS user who views the affected pages. The fix is to upgrade librenms/librenms to version 26.5.0 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.1 High 4.0 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 CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0033, the 26th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:06 UTC First seen by agentprime
  2. 31 Oct 2026, 14:06 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.