CVE-2026-126391 — N8n-io
HIGHCVE-2026-126391 is a high-severity (CVSS 7.5) Code Injection vulnerability. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
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…
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Description
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.
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
The records we use list no fixed release for CVE-2026-126391. Check the upstream advisory for a patched version, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
Frequently Asked Questions
Is CVE-2026-126391 in your dependencies?
Find it across your dependency tree, including transitive dependencies.