CVE-2026-27016
LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()
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.
INFO
Published Date :
Feb. 20, 2026, 2:16 a.m.
Last Modified :
Feb. 20, 2026, 4:22 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update LibreNMS to version 26.2.0 or later.
- Verify the unit parameter sanitization in Custom OID.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27016.
| URL | Resource |
|---|---|
| https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335 | Patch |
| https://github.com/librenms/librenms/pull/19040 | Issue Tracking |
| https://github.com/librenms/librenms/releases/tag/26.2.0 | Product Release Notes |
| https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27016 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27016
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27016 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-27016 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 20, 2026
Action Type Old Value New Value Added CWE CWE-79 Added CPE Configuration OR *cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:* versions from (including) 24.10.0 up to (excluding) 26.2.0 Added Reference Type GitHub, Inc.: https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/librenms/librenms/pull/19040 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/librenms/librenms/releases/tag/26.2.0 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g Types: Third Party Advisory -
New CVE Received by [email protected]
Feb. 20, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Added CWE CWE-79 Added CWE CWE-116 Added Reference https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335 Added Reference https://github.com/librenms/librenms/pull/19040 Added Reference https://github.com/librenms/librenms/releases/tag/26.2.0 Added Reference https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g