CVE-2026-21858

Name: CVE-2026-21858
Creator: NVD / NIST
Published: 2026-01-08T00:15:59.99+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 71.65%

Last modified Jun 17, 2026

CVE-2026-21858 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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. EPSS estimates a 71.65% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

10/10

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

EPSS Probability

71.65%

99.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
N8n	N8n	>= 1.65.0, < 1.121.0

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pgVendor Advisory
https://www.cyera.com/research-labs/ni8mare-unauthenticated-remote-code-execution-in-n8n-cve-2026-21858Exploit, Third Party Advisory

Timeline

Published: Jan 8, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21858?

How severe is CVE-2026-21858?

CVE-2026-21858 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 71.65% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21858?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21858?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST