High severity · published Sep 7, 2026
CVE-2026-86427
LibreNMS before 26.8.0 Argument Injection via graph_title
8.8
CVSS
0.6%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
librenms · librenms
before 26.8.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86427
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86427
Exploit
https://github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83
Third Party Advisory
https://www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title
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