CVE-2026-27016
LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()
CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 CWE-116 |
| Vendor | librenms |
| Product | librenms |
| Published | Feb 20, 2026 |
| Last Updated | Feb 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
librenms / librenms
>= 24.10.0, < 26.2.0
References
github.com: https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g github.com: https://github.com/librenms/librenms/pull/19040 github.com: https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335 github.com: https://github.com/librenms/librenms/releases/tag/26.2.0