GHSA-7CJ5-V4PP-V632

Vulnerability from github – Published: 2026-08-18 21:17 – Updated: 2026-08-18 21:17
VLAI
Summary
LibreNMS: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users
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.

Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "librenms/librenms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.7.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-18T21:17:20Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nThe `graph_descr.\u003cgraphtype\u003e` 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\u0027s browser viewing that graph type.\n\n### CVSS\n`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N` \u2014 **4.8 Medium**\n\n### Details\n```php\n// graphs.inc.php:194\necho LibrenmsConfig::get(\u0027graph_descr.\u0027 . $vars[\u0027type\u0027]);\n```\n\n### PoC\n```\nPUT /settings/graph_descr.device_processor\n{\"value\": \"\u003cimg src=x onerror=\\\"alert(\u0027ADV-15\u0027)\\\"\u003e\"}\n\nGET /graphs?type=device_processor\n\u2192 \u003cimg src=x onerror=\"alert(\u0027ADV-15\u0027)\"\u003e\n```\n\n### Fix\n```php\necho htmlspecialchars(LibrenmsConfig::get(\u0027graph_descr.\u0027 . $vars[\u0027type\u0027]), ENT_QUOTES, \u0027UTF-8\u0027);\n```\n\n### Prerequisite\nAdmin session to set the config value.",
  "id": "GHSA-7cj5-v4pp-v632",
  "modified": "2026-08-18T21:17:20Z",
  "published": "2026-08-18T21:17:20Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/security/advisories/GHSA-7cj5-v4pp-v632"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/librenms/librenms"
    },
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/releases/tag/26.7.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "LibreNMS: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users"
}



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