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CVE-2026-84192

LibreNMS before 26.3.1 Stored XSS via SNMP/Syslog Data

HIGH
7.1
CVSS Score
Published: September 1, 2026 at 11:33 AM UTC
Updated: October 8, 2026 at 04:17 PM UTC
1 product affected across 1 vendorLibrenms

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Severity
HIGH7.1
Exploit prediction
EPSS 0.3%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Librenms· Librenms
90%
0 ≤ v < 26.3.10
Vendor states this is fixed in 26.3.1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/librenms/librenms/security/advisories/GHSA-7w8c-qgxg-m7jx
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/librenms-before-26.3.1-stored-xss-via-snmp-syslog-data

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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