CVE-2026-59206High▾ Twilightn8n: Prototype Pollution via Workflow Credentials Leads to Unauthenticated User and Project Enumeration
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 22.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.3%
0.3% → 0.7%
An authenticated user with the default workflow:create permission could pollute Object.prototype through a crafted workflow saved, updated, or imported via the workflow API. This can be leveraged to bypass authentication, allowing unauthenticated requests to be treated as a privileged user and exposing endpoints such as the user and project listings. As a result, every account's personal data (email, role, MFA status) and all projects on the instance may be disclosed to unauthenticated callers. The pollution can also corrupt global state, making parts of the instance unresponsive until restarted.
The issue has been fixed in n8n versions 1.123.61, 2.27.4, and 2.28.1. Users should upgrade to one of these versions or later to remediate the vulnerability.
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
n8n < 1.123.61n8n >= 2.28.0, < 2.28.1n8n >= 2.0.0-rc.0, < 2.27.4Upgrade to a patched release:
n8n 1.123.61n8n 2.28.1n8n 2.27.4Connected by shared product, vendor, weakness, or advisory.
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CVE-2026-59207Highn8n: "Allowed HTTP Request Domains" Restriction Bypass via AI Agents MCP Connector
CVE-2026-86078Medium· 6.5n8n is an open source workflow automation platform
GHSA-xwx6-jjhv-84p8Highn8n: Prototype Pollution via Dot-Notation Field Names Leads To Instance-Wide Denial of Service
GHSA-hx4h-vr3m-45vhMediumn8n: Prototype Pollution via VM Expression Engine Sandbox Escape Leads to Denial of Service