Exploit for Improper Input Validation in N8N

CVE-2026-21858

githubexploit · 2026-01-21

Description

This document discusses an exploit targeting improper input validation in N8N.

Entry point

Parameterfiles.filepath · request body

Path/form/

Unauthenticated form-based file read to access arbitrary server files via the vulnerable form endpoint.

Affected n8n versions

n8n< 1.121.0

All known vulnerabilities by product

N8N

CVSS 10.0 for CVE-2026-21858

10.0

HIGH SEVERITY

Version 3.1

VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Attack Vector:NETWORK

Attack Complexity:LOW

Privileges Required:NONE

User Interaction:NONE

Scope:CHANGED

Confidentiality:HIGH

Integrity:HIGH

Availability:NONE

Working code

96%confidence this exploit runs

Based on 1 file(s) in the source

EPSS Score

78.2%higher than 99.5% of all CVEs

Updated 2026-08-25

Exploit Details

Modified:2026-01-21 15:01

Last Seen:2026-01-21 15:14

Reporter:MOGMUNI

Repository:No longer on GitHub

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Exploit Code

README2 lines

## https://sploitus.com/exploit?id=00392517-8E33-59F8-B026-B10CF3497B84
No description provided

Exploit Code

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