Is there a public exploit for CVE-2026-126391?

No public exploit for CVE-2026-126391 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-126391?

CVE-2026-126391 scores CVSS 7.7 (v4.0), rated high.

What does CVE-2026-126391 affect?

CVE-2026-126391 affects n8n-io n8n. It is part of the AI and agent stack (n8n).

7.7 High

n8n before 1.123.89 contains an insufficient isolation vulnerability in workflow expression evaluation that allows authenticated users to…

CVE-2026-126391

n8n before 1.123.89 contains an insufficient isolation vulnerability in workflow expression evaluation that allows authenticated users to escape the sandbox. Attackers with permission to create or modify workflows can craft expressions referencing unexpected JavaScript properties to execute arbitrary code on the n8n host.

Part of the AI stack

This affects n8n, in Agent frameworks.

Assessment

CVSS: 7.7 (v4.0)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 November 2026
Last updated: 13 November 2026
Affected: n8n-io · n8n
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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