CVE-2026-86426 PoC — LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-86426.yaml

Associated Vulnerability

Title: LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion (CVE-2026-86426)
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.

Description

LibreNMS <= 26.8.0 contains an authentication bypass caused by MySQL type coercion in the REST API token validation, letting unauthenticated attackers access protected endpoints and execute remote code via alert templates.

File Snapshot

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