CVE-2026-86426

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    CVE-2026-86426

    Published: 7 Sept 2026Last Modified: 20 Sept 2026

    Summary: LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86426.json, https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg, https://nvd.nist.gov/vuln/detail/CVE-2026-86426, https://www.vulncheck.com/advisories/librenms-before-26.8.0-authentication-bypass-via-api-token-type-confusion

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -d2b6e2557b637a606612959e6007150c3726fb43

    Affected versions

    26.7.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-86426 | CVE-DB