Rapid7

module

n8n arbitrary file read

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Disclosed
N/A
Created
Feb 16, 2026

Description

This module exploits CVE-2026-21858, a critical unauthenticated remote code execution vulnerability in n8n workflow automation platform versions 1.65.0 through 1.120.x. The vulnerability, dubbed "Ni8mare", is a content-type confusion flaw in webhook request handling that allows attackers to achieve arbitrary file read.

Authors

dor attias
msutovsky-r7

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


    msf > use auxiliary/gather/ni8mare_cve_2026_21858
    msf auxiliary(ni8mare_cve_2026_21858) > show actions
        ...actions...
    msf auxiliary(ni8mare_cve_2026_21858) > set ACTION < action-name >
    msf auxiliary(ni8mare_cve_2026_21858) > show options
        ...show and set options...
    msf auxiliary(ni8mare_cve_2026_21858) > run
Title
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