CVE-2026-26989

Name: CVE-2026-26989
Creator: NVD / NIST
Published: 2026-02-20T02:16:54.71+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2026-26989 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

0.24%

14.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Librenms	Librenms	< 26.2.0

References

https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58Patch
https://github.com/librenms/librenms/pull/19039Issue Tracking
https://github.com/librenms/librenms/releases/tag/26.2.0Product, Release Notes
https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7Exploit, Third Party Advisory

Timeline

Published: Feb 20, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-26989?

How severe is CVE-2026-26989?

CVE-2026-26989 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2026-26989?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-26989?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST