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LibreNMS CVE-2026-84188

| EUVDEUVD-2026-69025 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-09-01 VulnCheck GHSA-pvwj-jwv3-68ww
XSS PHP Librenms
4.8
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
4.8 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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:X/V:X/RE:X/U:X
vuln.today AI
4.8 MEDIUM

Admin write access required (PR:H), victim must load the page (UI:R), payload crosses into victim browser session (S:C); no availability impact warranted.

3.1 AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
P
Scope
X

Lifecycle Timeline

3
Patch available
Sep 01, 2026 - 13:01 EUVD
Source Code Evidence Fetched
Sep 01, 2026 - 12:09 vuln.today
Analysis Generated
Sep 01, 2026 - 12:09 vuln.today

DescriptionCVE.org

LibreNMS versions <= 26.4.0 contain a stored cross-site scripting vulnerability in the graph_descr.<graphtype> configuration settings, which are echoed verbatim without HTML escaping in includes/html/pages/graphs.inc.php. An administrator can store a malicious HTML payload that executes in the browser of any authenticated user who views the affected graph type. The issue is fixed in version 26.7.0.

AnalysisAI

Stored cross-site scripting in LibreNMS 26.4.0 and below allows an authenticated administrator to inject arbitrary HTML/JavaScript into graph description configuration keys, which then execute in the browsers of every authenticated user who views the affected graph type. The vulnerable sink is includes/html/pages/graphs.inc.php:194, where LibrenmsConfig::get() output is echoed without htmlspecialchars(). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires an active administrator-level session in LibreNMS with write access to the `graph_descr.<graphtype>` settings namespace via the PUT settings API endpoint - this corresponds to CVSS PR:H. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector confirmed by the GHSA advisory - AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N - scores 4.8 Medium, accurately reflecting the high privilege prerequisite (PR:H) and required victim interaction (UI:R) that substantially bound real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade LibreNMS to version 26.7.0, which applies `htmlspecialchars(..., ENT_QUOTES, 'UTF-8')` to the graph description output at `includes/html/pages/graphs.inc.php:194`, eliminating the unescaped echo. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-84188 vulnerability details – vuln.today
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