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CVE-2026-86426LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion
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.
9.2 CRITICALEPSS 4.35%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.2 | CRITICAL | 4.0VulnCheck (CNA) | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 9.8 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Details
- CVE ID
- CVE-2026-86426
- Status
- Analyzed
- Assigner (CNA)
- VulnCheck
- Published
- Sep 7, 2026
- Last modified
- 2026-09-18 18:37 UTC
- Weaknesses
- CWE-287 · Improper Authentication
Affected Products
As published by the CNA in the CVE record.
librenmslibrenms1 version range
- before 26.8.0