CVE-2026-84193

Summary

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.

Affected Software

Weaknesses

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/librenms/librenms/security/advisories/GHSA-v5jp-f342-234h

References

• https://github.com/librenms/librenms/security/advisories/GHSA-v5jp-f342-234h
• https://www.vulncheck.com/advisories/librenms-through-26.2.0-stored-cross-site-scripting-via-snmp

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