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TI-2026-57887 Aliases CVE-2026-84191GHSA-3cvh-rhc6-7rhc

LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields

Priority LOW 30CWE-79Published · Updated

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
Low · Low · None
Fix status
Fixed

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

Summary

LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf_name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrary JavaScript through SNMP responses that executes in the browser of any user viewing VRF-related pages.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00263 18th percentileScored 2026-11-07
Fix Fixed librenms (librenms): 26.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
librenmslibrenmsbefore 26.5.026.5.0Patch availableCNA
  • librenms Vendorlibrenms Affected before 26.5.0 Fixed in 26.5.0 Patch available CNA

CPE names Threatist (inferred) · 1

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

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

Remediation

  • Fix · CNA librenms (librenms) Fixed in 26.5.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    librenms 26.5.0

    2 records Highest priority Priority HIGH 1 HIGH, 1 LOW

    Other records, highest priority first

    • TI-2026-57886 LibreNMS before 26.5.0 Remote Code Execution via AboutControllerPriority HIGH 73
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84191
  2. 2026-10-03 Alias added: GHSA-3cvh-rhc6-7rhc

References

Advisory 1

  • 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