How severe is CVE-2026-21858?

CVE-2026-21858 has a CVSS 3.1 base score of 10 (CRITICAL). EPSS estimates a 78.4% probability of exploitation in the next 30 days.

CVE-2026-21858: n8n Vulnerable to Unauthenticated File Access via

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.

Severity

CVSS 3.1 · CNA10 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

SSVC · CISA-ADP

Exploitationnone

Automatableyes

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
n8n-io	n8n	>= 1.65.0, < 1.121.0

References

2 Links

Other references

Record Details

Published

2026-01-07

Last updated

2026-01-12

Assigner (CNA)

GitHub_M

Credited to

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