CVE-2026-86426
LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion
- Published
- Sep 7, 2026
- Updated
- Sep 8, 2026
- Assigning CNA
- VulnCheck
- Evidence observed
- Oct 28, 2026
Primary CVSS
nvd · CVSS 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XLow · next 30 days
- Percentile
- 91.2%
- Model date
- Oct 27, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
http/cves/2026/CVE-2026-86426.yaml
Nuclei TemplatesDeclared conditions
- network: http($.protocol_keys)
- verification: dsl($.matchers[*].type)
Proof-of-concept and recon framework for CVE-2026-86426, a LibreNMS API authentication bypass via type confusion, extracting SNMP credentials and mapping network topology.
Responsible use
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