TI-2026-57888 Aliases CVE-2026-84192 GHSA-r97f-5q78-rq8c

LibreNMS before 26.3.1 Stored XSS via SNMP/Syslog Data

MEDIUM 64CWE-79Published 2026-09-01 · Updated 2026-10-08

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00331 26th percentileScored 2026-11-07

Fix Fixed librenms (librenms): 26.3.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
librenms	librenms	before 26.3.1	26.3.1	Patch available	CNA

librenms Vendorlibrenms Affected before 26.3.1 Fixed in 26.3.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:librenms:librenms::::::::	—	—	librenms

cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:* Versions — — ·librenms

Remediation

Fix · CNA librenms (librenms) Fixed in 26.3.1

Timeline

2026-10-02 Threatist record created from CVE-2026-84192
2026-10-03 Alias added: GHSA-r97f-5q78-rq8c

References

Advisory 1

GitHub Security Advisory (GHSA-7w8c-qgxg-m7jx)

TI-2018-14479 LibreNMS 1.46 allows remote attackers to execute arbitrary OS commands by using the… CVSS 3.0CRITICAL 9.8
TI-2026-71173 LDAP filter injection in LibreNMS allows authentication bypass CVSS 4.0CRITICAL 9.2
TI-2026-59134 LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion CVSS 4.0CRITICAL 9.2
TI-2026-57885 LibreNMS before 26.7.0 Stored XSS via Oxidized API CVSS 4.0CRITICAL 9.2
TI-2022-03735 Insufficient Session Expiration in librenms/librenms CVSS 3.1CRITICAL 9.8
TI-2026-57886 LibreNMS before 26.5.0 Remote Code Execution via AboutController CVSS 4.0HIGH 8.7

See all 123 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences