CVE-2026-86076highCWE-94

CVE-2026-86076: high-severity vulnerability in n8n-io n8n

n8n: Expression Sandbox Escape in Editor-UI Enables Stored Cross-User JavaScript Execution

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41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 8.7epss 0.8%
from disclosure to weapon46 days
Published on NVDSep 8
1st PoC+46d
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.
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
Affected products
n8n-io · n8n
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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