CVE-2026-110842
n8n before 2.41.4 and 2.42.1 Prototype Pollution via MCP Workflow-Validation Interpreter
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1321 |
| Vendor | n8n-io |
| Product | n8n |
| Published | Oct 14, 2026 |
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Affected Versions
n8n-io / n8n
0 < 2.41.4 2.42.0 < 2.42.1
References
Credits
🔍 sm1ee