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Improper Input Validation

CVE-2026-21858

High
10/10

Summary

n8n is an open source workflow automation platform. Versions prior to 1.121.0 enable an attacker to access files on the underlying server through the execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker, resulting in exposure of sensitive information stored on the system, and may enable further compromise depending on deployment configuration and workflow usage. This issue is fixed in version 1.121.0.

  • LOW
  • NETWORK
  • HIGH
  • CHANGED
  • NONE
  • NONE
  • HIGH
  • NONE

CWE-20 - Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

References

Advisory Timeline

  • Published