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GHSA-v4pr-fm98-w9pg

n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

Source: GitHub Advisory Database (reviewed) Critical CVE-2026-21858

Packages

EcosystemPackageAffectedFixed in
npm n8n >= 1.65.0, < 1.121.0 1.121.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact A vulnerability in n8n allows an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker. This could result in exposure of sensitive information stored on the system and may enable further compromise depending on deployment configuration and workflow usage. ### Patches The issue has been fixed in n8n version 1.121.0. Users should upgrade to this version or later to remediate the vulnerability. ### Workarounds No official workarounds are available. As a temporary mitigation, users may restrict or disable publicly accessible webhook and form endpoints until upgrading.

References

External links from the advisory. They lead to third-party sites.