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CVE-2026-27016

MEDIUM

5.4

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.

CVE Details

CVSS v3.1 Score5.4

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

Published2/20/2026

Last Modified2/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

librenms:librenms

Weaknesses (CWE)

CWE-79CWE-116CWE-79

References

https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335(security-advisories@github.com)

https://github.com/librenms/librenms/pull/19040(security-advisories@github.com)

https://github.com/librenms/librenms/releases/tag/26.2.0(security-advisories@github.com)

https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g(security-advisories@github.com)

IOC Correlations

No correlations recorded

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