CVE-2026-86076
n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the expression compiler sanitizer resolved through dynamically scoped this and did not reject reserved class member names. A class field named __sanitize could rebind the sanitizer and reach the Function constructor, enabling backend code execution and editor-preview JavaScript execution. The affected AST hook is PrototypeSanitizer in packages/workflow/src/expression-sandboxing.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.7
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N
- EPSS probability
- 0.33%
- CWE
- CWE-94
- Published
- 2026-09-08
- Last modified
- 2026-09-09
Affected products
- n8n-io n8n
- n8n-io n8n
- n8n-io n8n
Weakness type
Related vulnerabilities
- CVE-2026-81803 — WordPress RepairBuddy plugin <= 4.1224 - Remote Code Execution (RCE) vulnerability
- CVE-2026-66632 — WordPress Simple Cloudflare Turnstile plugin <= 1.42.1 - Content Injection vulnerability
- CVE-2026-80352 — Apache Camel K: Camel K Master trait serviceAccountName YAML injection lets CR author apply arbitrary objects
- CVE-2026-19584 — Velociraptor VQL injection during notebook restore from backup
- CVE-2026-87926 — Rizwan17 inventory-management-system Login Page index.php cross site scripting
- CVE-2026-87923 — Rizwan17 inventory-management-system List DBOperation.php cross site scripting
- CVE-2026-87817 — GitPython before 3.1.60 Remote Code Execution via Git Directory Impersonation
- CVE-2026-41870 — Apache Nutch: Unauthenticated remote code execution (RCE) via JEXL injection in Nutch Server (Nutch REST API)