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OpenAdvisories
Medium · 5.4 CVE-2026-27016 EUVD-2026-8036GHSA-fqx6-693c-f55g

LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()

Published Feb 20, 2026 · Updated Feb 20, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
librenms librenms >= 24.10.0, < 26.2.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist librenms/librenms >= 24.10.0, < 26.2.0 26.2.0 GHSA-fqx6-693c-f55g

References