CVE-2026-86427

8.7 highEPSS 0.6%

High (8.7) in librenms librenms. EPSS 0.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.7 high

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

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 48% of CVEs (scores of 2026-10-31)
CWE: CWE-77
Published: 2026-09-07
Modified: 2026-09-18
Record from: the NVD, synced 2026-10-19

Affected

librenms:librenms

References

https://github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83
https://www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title

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