CVE-2026-27016

low-risk
Published 2026-02-20

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.

Do I need to act?

-
0.00% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.4/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Librenms

References (4)

Patch https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94a...
Issue Tracking https://github.com/librenms/librenms/pull/19040
Product https://github.com/librenms/librenms/releases/tag/26.2.0
Third Party Advisory https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g
26
/ 100
low-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal