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VULNERABILITIES

CVE-2026-86426 Details

Description

LibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthenticated attackers to access protected endpoints by sending numeric values instead of string tokens. Attackers can exploit MySQL type coercion by sending small integers like 0 through 9 to match token hashes, gaining access to API functionality including device credentials and administrative features that enable remote code execution through alert templates.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg CISA-ADPExploitVendor Advisory
https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg [email protected]ExploitVendor Advisory
https://www.vulncheck.com/advisories/librenms-before-26.8.0-authentication-bypass-via-api-token-type-confusion [email protected]Third Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-287Improper Authentication[email protected]

Affected Products

ProductVersions
librenms librenms
< 26.8.0

CPE

  • cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-86426
NVD Published Date:
Sep 7, 2026
NVD Last Modified:
Sep 18, 2026
Source:
[email protected]
CVE-2026-86426 Details - Not Deferred