SB2026020961 - Arbitrary file upload in n8n merge node
Published: February 9, 2026
Security Bulletin ID
SB2026020961
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Arbitrary file upload (CVE-ID: CVE-2026-25056)
CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type
CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to compromise vulnerable system.
The vulnerability exists due to insufficient validation of file during file upload in the Merge node's SQL Query mode. A remote user with permission to create or modify workflows can write arbitrary files to the n8n server's filesystem and execute them on the server.
Remediation
Install update from vendor's website.