Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| N8N | N8N | < 1.123.64 |
Related Weaknesses (CWE)
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-pm35-fqvh-cq5gMitigationVendor Advisory
- https://www.vulncheck.com/advisories/n8n-before-sanitizer-bypass-remote-code-exeThird Party Advisory
FAQ
What is CVE-2026-65591?
CVE-2026-65591 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 expre...
How severe is CVE-2026-65591?
CVE-2026-65591 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-65591?
Check the references section above for vendor advisories and patch information. Affected products include: N8N N8N.