CVE-2026-86427Public exploitNetwork attack vector

RRD data access via graph_title argument injection

Published Sep 7, 2026 · Updated Sep 10, 2026

Argument injection in LibreNMS before 26.8.0 allows remote authenticated users to read or alter RRD data through graph_title. GraphParameters strips single quotes but leaves double quotes and newlines before Rrd::graph wraps options for RRDtool stdin, allowing graph_title to terminate its quoted argument and add DEF, LINE, fetch, or update commands. Any authenticated user can cross device authorization boundaries; unauthenticated reachability exists only when unauthenticated graphs are enabled.

CVSS severity8.7
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in LibreNMS before 26.8.0 allows remote authenticated users to read or alter RRD data through graph_title. GraphParameters strips single quotes but leaves double quotes and newlines before Rrd::graph wraps options for RRDtool stdin, allowing graph_title to terminate its quoted argument and add DEF, LINE, fetch, or update commands. Any authenticated user can cross device authorization boundaries; unauthenticated reachability exists only when unauthenticated graphs are enabled.

The record

CVE
CVE-2026-86427
Published
Sep 7, 2026
Updated
Sep 10, 2026
Vendor
LibreNMS
Product
LibreNMS
Classifications
CWE-77, T1565.001, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LibreNMS · LibreNMSversion=0 <26.8.0

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1565.001Stored Data Manipulation
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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