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Vulnerability record · CVE-2026-26992 · published 20 February 2026

CVE-2026-26992: Librenms cross-site scripting vulnerability

Librenms · Librenms

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.

5.1 CVSS 4.0 Medium EPSS 0.32% · top 77.1% CWE-79 · Cross-site scripting
5.1CVSS 4.0 base score
0.32%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/librenms/librenms/commit/882fe6f90ea504a3732f83caf89bba7850a5699f Patch
https://github.com/librenms/librenms/pull/19042 Issue Tracking
https://github.com/librenms/librenms/releases/tag/26.2.0 ProductRelease Notes
https://github.com/librenms/librenms/security/advisories/GHSA-93fx-g747-695x ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-4070Librenms insufficient session expiration vulnerabilityInsufficient Session Expiration in GitHub repository librenms/librenms prior to 22.10.0.EPSS 0.65%9.8CVE-2022-29712Librenms command injection vulnerabilityLibreNMS v22.3.0 was discovered to contain multiple command injection vulnerabilities via the service_ip, hostname, and service_param parameters.EPSS 1.7%9.8CVE-2021-44278Librenms path traversal vulnerabilityLibrenms 21.11.0 is affected by a path manipulation vulnerability in includes/html/pages/device/showconfig.inc.php.EPSS 1.5%9.8CVE-2019-10665Librenms injection vulnerabilityAn issue was discovered in LibreNMS through 1.47. The scripts that handle the graphing options (html/includes/graphs/common.inc.php and html/includes…EPSS 1.5%9.8CVE-2018-20434LibreNMS addhost OS command injection via community parameterLibreNMS 1.46 fails to sanitize the $_POST['community'] parameter in html/pages/addhost.inc.php when creating a new device, and the value is later mi…EPSS 71%analysed9.3CVE-2026-26988Librenms sql injection vulnerabilityLibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below contain an SQL Injection vulnerability in th…EPSS 0.48%9.2CVE-2026-86426Librenms improper authentication vulnerabilityLibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthenticated attackers to access protected endp…EPSS 3.9%9.1CVE-2024-51092Librenms os command injection vulnerabilityLibreNMS before 24.10.0 allows a remote attacker to execute arbitrary code via OS command injection involving AboutController.php's index(), Settings…EPSS 7.2%

Source: NIST National Vulnerability Database (record CVE-2026-26992), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.