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Vulnerability record · CVE-2026-86427 · published 7 September 2026

CVE-2026-86427: Librenms command injection vulnerability

Librenms · Librenms

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.

8.7 CVSS 4.0 High EPSS 0.61% · top 53.2% CWE-77 · Command injection
8.7CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
18 Sep 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-4070Librenms insufficient session expiration vulnerabilityInsufficient Session Expiration in GitHub repository librenms/librenms prior to 22.10.0.EPSS 0.65%9.8CVE-2022-29712Librenms command injection vulnerabilityLibreNMS v22.3.0 was discovered to contain multiple command injection vulnerabilities via the service_ip, hostname, and service_param parameters.EPSS 1.7%9.8CVE-2021-44278Librenms path traversal vulnerabilityLibrenms 21.11.0 is affected by a path manipulation vulnerability in includes/html/pages/device/showconfig.inc.php.EPSS 1.5%9.8CVE-2019-10665Librenms injection vulnerabilityAn issue was discovered in LibreNMS through 1.47. The scripts that handle the graphing options (html/includes/graphs/common.inc.php and html/includes…EPSS 1.5%9.8CVE-2018-20434LibreNMS addhost OS command injection via community parameterLibreNMS 1.46 fails to sanitize the $_POST['community'] parameter in html/pages/addhost.inc.php when creating a new device, and the value is later mi…EPSS 71%analysed9.3CVE-2026-26988Librenms sql injection vulnerabilityLibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below contain an SQL Injection vulnerability in th…EPSS 0.48%9.2CVE-2026-86426Librenms improper authentication vulnerabilityLibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthenticated attackers to access protected endp…EPSS 3.9%9.1CVE-2024-51092Librenms os command injection vulnerabilityLibreNMS before 24.10.0 allows a remote attacker to execute arbitrary code via OS command injection involving AboutController.php's index(), Settings…EPSS 7.2%

Source: NIST National Vulnerability Database (record CVE-2026-86427), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.