CVE-2026-110842
CVE-2026-110842 · n8n before 2.41.4 and 2.42.1 Prototype Pollution via MCP Workflow-Validation Interpreter
This page contains facts from public vulnerability sources. Check the original advisory before updating.
n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability in the MCP workflow-validation tool, whose interpreter evaluates caller-supplied code in the main process, reads inherited properties, and permits assignment onto shared prototypes. An authenticated member holding only a workflow:read grant can replace a built-in method with one returning a truthy value so server-side permission checks accept unheld scopes, enabling takeover of owner accounts not protected by MFA.
CVSS 7.7 · High · EPSS 0.3% · Fix available
- Published
- Updated
Affected products and versions
n8n
- Versions
- ≥ 0, < 2.41.4: Affected (semver)
- ≥ 2.42.0, < 2.42.1: Affected (semver)
Update to 2.41.4; Update to 2.42.1