CVE-2026-21858 (GCVE-0-2026-21858)
Vulnerability from cvelistv5 – Published: 2026-01-07 23:57 – Updated: 2026-01-12 18:37
VLAI
EPSS
VEX
Title
n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
Summary
n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable 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, 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.
Severity
10 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-08 19:09 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/n8n-io/n8n/security/advisories… | x_refsource_CONFIRM |
| https://www.cyera.com/research-labs/ni8mare-unaut… | x_refsource_MISC |
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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