PT-2026-83379 · Packagist · Librenms/Librenms
Publicado
2026-08-18
·
Atualizado
2026-08-18
CVSS v3.1
8.1
Alta
| Vetor | AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N |
Summary
The Oxidized integration URL (
oxidized.url) is admin-configurable. LibreNMS fetches device info and version history from that URL and renders JSON fields (name, ip, model, author, commit message) into HTML without htmlspecialchars(). An admin pointing the URL at an attacker-controlled server achieves persistent XSS affecting all users who view any device's showconfig tab.CVSS
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N — 8.1 HighDetails
php
// includes/html/pages/device/showconfig.inc.php:276-278
echo '<li ...><strong>Node:</strong> ' . $node info['name'] . '</li>';
echo '<li ...><strong>IP:</strong> ' . $node info['ip'] . '</li>';
echo '<li ...><strong>Model:</strong> '. $node info['model'] . '</li>';
// lines 349, 353: author and commit message also unescapedAttack chain
- Admin sets
oxidized.urltohttp://attacker.example.com/. - Attacker server returns
{"name":"<img src=x onerror=alert(1)>","ip":"x","model":"x"}. - Any user viewing any device showconfig tab triggers the XSS.
PoC
Mock Oxidized server confirmed in response:
[!!!] CONFIRMED — ...<strong>Node:</strong> <img src=x onerror="alert('SSRF-XSS-oxidized')">...Fix
php
echo '<li ...><strong>Node:</strong> ' . htmlspecialchars($node info['name'], ENT QUOTES, 'UTF-8') . '</li>';Apply to all fields from
$node info, $author, $msg.Prerequisite
Admin session. Oxidized integration must be enabled.
Correção
SSRF
XSS
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Librenms/Librenms