What’s Vulnerable › Vulnerabilities

CVE-2026-84193: LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP

• Severity: medium (CVSS 5.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-09-08
• Weakness: CWE-79

Description

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 products

• librenms: through 26.2.0

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

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