CVE-2026-27016

Name: CVE-2026-27016
Creator: NVD / NIST
Published: 2026-02-20T02:16:55.14+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2026-27016 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 24.10.0 through 26.1.1 are vulnerable to Stored XSS via the unit parameter in Custom OID. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 24.10.0 through 26.1.1 are vulnerable to Stored XSS via the unit parameter in Custom OID. The Custom OID functionality lacks strip_tags() sanitization while other fields (name, oid, datatype) are sanitized. The unsanitized value is stored in the database and rendered without HTML escaping. This issue is fixed in version 26.2.0.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.23%

13.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Librenms	Librenms	>= 24.10.0, < 26.2.0

References

https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335Patch
https://github.com/librenms/librenms/pull/19040Issue Tracking
https://github.com/librenms/librenms/releases/tag/26.2.0Product, Release Notes
https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55gThird Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2026-27016?

How severe is CVE-2026-27016?

CVE-2026-27016 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2026-27016?

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-2026-27016?

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

Scan your code now

Source: NVD / NIST