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Description

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.

PUBLISHED Reserved 2026-02-17 | Published 2026-02-20 | Updated 2026-02-20 | Assigner GitHub_M




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 26.2.0
affected

References

github.com/...brenms/security/advisories/GHSA-6xmx-xr9p-58p7

github.com/librenms/librenms/pull/19039

github.com/...ommit/087608cf9f851189847cb8e8e5ad002e59170c58

github.com/librenms/librenms/releases/tag/26.2.0

cve.org (CVE-2026-26989)

nvd.nist.gov (CVE-2026-26989)

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