Vulnerability · Published Sep 1, 2026 · Assigned by VulnCheck

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

Medium 5.8

In plain English

A medium-severity cross-site scripting in librenms from librenms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).

Severity (CVSS 4.0)5.8Medium

Exploit odds (30 days)0.3%top 71.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
librenms	librenms	0 – through 26.2.0

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

References

GitHub Security Advisory (GHSA-v5jp-f342-234h) vendor-advisory
VulnCheck Advisory: LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP third-party-advisory