Vulnerability details

CVE-2026-21858

n8n-io n8n

n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

CVSS 3.1

10.0Critical

Official description

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.

CVSS scores

Score	Version	Source	Vector
10.0Critical	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
n8n-io	n8n	>= 1.65.0, < 1.121.0	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pg x_refsource_CONFIRM
https://www.cyera.com/research-labs/ni8mare-unauthenticated-remote-code-execution-in-n8n-cve-2026-21858 x_refsource_MISC

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Details

Published: 2026-01-08
Last updated: 2026-01-12
State: Published
Assigner (CNA): GitHub_M
Kolun priority: 40 · Medium

Exploit prediction (EPSS)

78.18%

Probability of exploitation in 30 days

99.5%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-20
Improper Input Validation