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Is it dangerous if a n8n workflow can be ran by a user? (lemmy.zip)

submitted 1 day ago by SpiderUnderUrBed@lemmy.zip to c/selfhosted@lemmy.world

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I just finished making a site, it has multiple ways emails are stored, I made a n8n workflow that gets the stored emails, checks if it has not been added onto a spreadsheet before, deduplicates it, then adds it to a spreadsheet. This workflow runs anytime a new email is submitted. This is my first time using n8n, is this dangerous? in the sense that having a n8n workflow that can be triggered directly by users, can it cause massive usage spikes in memory, etc very easily when its dependent on what a user can do? even if i ratelimit it, because I dont know the overhead n8n has, it takes a minute for the workload to finish also.

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[–] frongt@lemmy.zip 5 points 1 day ago

I'm not familiar with n8n, but any time you accept user input, it's dangerous. What happens if a user submits 10,000 emails per second? What if they submit user@example.com'; DROP TABLE emails; --, or whatever the n8n equivalent of SQL injection is? What if they submit ,,,,,,,,,,,,,,,,? What if they submit a blank field? What if they submit completely invalid random binary data? What if they submit a very, very, very long email address?