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CVE-2026-65591

HighPublished

n8n before 1.123.64 Sanitizer Bypass Remote Code Execution

Published: Jul 22, 2026
Updated: Jul 22, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 10, 2026

Primary CVSS

8.9/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 40.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.

Sources

CVE-2026-65591PoC
PoC exploit for a sanitizer bypass in n8n legacy expression evaluator leading to host-level code execution by authenticated workflow creators.

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