CVE-2026-26989 MEDIUM

CVE-2026-26989: LibreNMS has Stored XSS in Alert Rule

Vendor Librenms
Product librenms
Weakness CWE-79 · XSS
Published February 20, 2026
Last update February 20, 2026
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are affected by a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Rules workflow. An attacker with administrative privileges can inject malicious scripts that execute in the browser context of any user who accesses the Alert Rules page. This issue has been fixed in version 26.2.0.

Key dates

02Disclosure timeline

February 20, 2026 CVE published
February 20, 2026 Record updated