CVE-2026-27016 MEDIUM

CVE-2026-27016: LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()

Vendor Librenms
Product librenms
Weakness CWE-79 · XSS
Published February 20, 2026
Last update February 20, 2026
View on NVD All CVEs

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 20, 2026 CVE published
February 20, 2026 Record updated