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CVE-2026-26991

MEDIUM

4.8

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.

CVE Details

CVSS v3.1 Score4.8

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredHIGH

User InteractionREQUIRED

Published2/20/2026

Last Modified2/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

librenms:librenms

Weaknesses (CWE)

CWE-79

References

https://github.com/librenms/librenms/commit/64b31da444369213eb4559ec1c304ebfaa0ba12c(security-advisories@github.com)

https://github.com/librenms/librenms/pull/19041(security-advisories@github.com)

https://github.com/librenms/librenms/releases/tag/26.2.0(security-advisories@github.com)

https://github.com/librenms/librenms/security/advisories/GHSA-5pqf-54qp-32wx(security-advisories@github.com)

IOC Correlations

No correlations recorded

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