CRITICAL CWE-20
CVE-2026-21858
n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
10.0/ 10
CVSS 3.1
Critical severity
78%
EPSS exploit odds
Chance of exploitation in the next 30 days
Higher than 99.6% of all CVEs
Not listed
CISA KEV catalog
No confirmed in-the-wild exploitation on CISA's list.
Timeline
- Published
- Jan 7, 2026
- Updated
- Jan 12, 2026
- First covered
- Jul 31, 2026
- Latest story
- 4 months ago
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.
CWE-20Improper Input Validation
Attack profile
Attack vectorNetwork
ComplexityLow
PrivilegesNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:NAffected products
- n8n>= 1.65.0, < 1.121.0