CVE-2026-65591: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') in n8n-io n8n
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.
AI Analysis
Technical Summary
CVE-2026-65591 is an expression language injection vulnerability in n8n's legacy expression evaluator. It allows an authenticated user with workflow creation or modification privileges to bypass input sanitization in the computed-member handler, leading to host-level code execution under the n8n process. The vulnerability affects versions prior to 1.123.64, versions from 1.123.64 up to but not including 2.29.8, and versions from 2.29.8 up to but not including 2.30.1. The issue is resolved in n8n 1.123.64, 2.29.8, and 2.30.1.
Potential Impact
Successful exploitation allows an authenticated user with limited privileges (workflow create or modify) to execute arbitrary code on the host running the n8n process. This can lead to full compromise of the host environment under the n8n process context, posing a significant security risk.
Mitigation Recommendations
A fix is available. Users should upgrade to n8n versions 1.123.64, 2.29.8, or 2.30.1 or later to remediate this vulnerability. No additional mitigation guidance is provided by the vendor advisory.
CVE-2026-65591: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') in n8n-io n8n
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 v4.0
Score 8.9high
Affected software
pkg:github/n8n-io/n8nRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-65591 is an expression language injection vulnerability in n8n's legacy expression evaluator. It allows an authenticated user with workflow creation or modification privileges to bypass input sanitization in the computed-member handler, leading to host-level code execution under the n8n process. The vulnerability affects versions prior to 1.123.64, versions from 1.123.64 up to but not including 2.29.8, and versions from 2.29.8 up to but not including 2.30.1. The issue is resolved in n8n 1.123.64, 2.29.8, and 2.30.1.
Potential Impact
Successful exploitation allows an authenticated user with limited privileges (workflow create or modify) to execute arbitrary code on the host running the n8n process. This can lead to full compromise of the host environment under the n8n process context, posing a significant security risk.
Mitigation Recommendations
A fix is available. Users should upgrade to n8n versions 1.123.64, 2.29.8, or 2.30.1 or later to remediate this vulnerability. No additional mitigation guidance is provided by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-07-22T10:45:44.832Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a60ab939c2644c7f8eced27
Added to database: 07/22/2026, 11:37:55 UTC
Last enriched: 07/22/2026, 11:52:47 UTC
Last updated: 07/23/2026, 02:51:54 UTC
Views: 5
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