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GHSA-7gww-x7fh-jf9j

HighCVSS 8.1 / 10
Published Aug 18, 2026·Last modified Aug 18, 2026
Affected Components(1)
Packagist logolibrenms/librenms
< 26.7.0
Description

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 High

Details

// 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 unescaped

Attack chain

  1. Admin sets oxidized.url to http://attacker.example.com/.
  2. Attacker server returns {"name":"<img src=x onerror=alert(1)>","ip":"x","model":"x"}.
  3. 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

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.

Risk Scores
Base Score
8.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.

Threat Intelligence
7.4

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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