CVE-2026-86427CWE-77

LibreNMS before 26.8.0 Argument Injection via graph_title

High · published September 7, 2026

CVSS v3.1
8.8
EPSS
—
In the wild
Unconfirmed
What it is

LibreNMS before 26.8.0 contains an argument injection vulnerability in the graph_title parameter that allows authenticated attackers to inject arbitrary rrdtool arguments by breaking out of double-quote escaping. Attackers can inject DEF and LINE arguments to read RRD files from unauthorized devices, or use newline injection to execute arbitrary rrdtool commands, bypassing per-device authorization checks.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
Not scored
Weakness
CWE-77 · Improper Neutralization of Special Elements used in a Command ('Command Injection')
Published
2026-09-07T12:53Z
Timeline
  • 07 SEP 12:53Z
    LibreNMS before 26.8.0 Argument Injection via graph_title
    cvelistv5