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CVE-2026-26989

4.3 · MEDIUM

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool.

Published Feb 20, 2026CWE-79EPSS 0.35%

Overview

CVE-2026-26989 is a medium-severity vulnerability. It was published on February 20, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58GitHubgithub.com/librenms/librenms/pull/19039GitHubgithub.com/librenms/librenms/releases/tag/26.2.0GitHubgithub.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-26989?

CVE-2026-26989 is a medium-severity vulnerability. It was published on February 20, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-26989?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-26989?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-26989?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-26989 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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