Medium 5.4Published Feb 20, 2026

CVE-2026-27016LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool.

Updated under an hour ago (2026-10-19 06:20 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.4 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79, CWE-116
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

librenms librenms librenms:librenms	from 24.10.0 before 26.2.0	NVD

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.