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3.7
n8n could let attackers upload harmful files
published 9 days ago
Summary
The n8n automation tool uses the multer component to process file uploads. A weakness in this processing could allow an attacker to upload malicious files that might be executed or expose data. Apply the latest n8n update or patch the multer library to close the gap.
What to do
- Update cleanstart n8n to version 2.28.0-r4.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| CleanStart | cleanstart | n8n |
< 2.28.0-r4 Fix: upgrade to 2.28.0-r4
|
Original advisory text
multer is a middleware for handling multipart/form-data in Node
Security vulnerability affects the n8n package. multer is a middleware for handling multipart/form-data in Node.
Internet-facing
14 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically (estimated)
- Gives an attacker partial control (estimated)
Timeline
Published10 Oct 2026
Updated10 Oct 2026
First seen10 Oct 2026
Sources
CLEANSTART-2026-VJ23809 · OSV
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