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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

Multiple patched vulnerabilities in n8n and n8n-MCP MCP servers

A cluster of CVEs disclosed in May 2026 affected n8n's MCP OAuth client registration endpoint (unauthenticated memory-exhaustion denial of service) and the n8n-MCP server, which had two server-side request forgery flaws (including IPv6-mapped bypass reaching cloud metadata endpoints and forwarding the n8n API key) and two logging flaws that persisted bearer tokens, API keys and credential-bearing tool arguments in server logs. All issues were fixed in updated releases.

Disclosed 4 May 2026 · Record updated 13 September 2026

Impact

Unauthenticated attackers could render an n8n instance unavailable; attackers supplying n8nApiUrl or x-n8n-url values could force requests to cloud metadata, private networks or localhost with the n8n API key forwarded and responses returned; bearer tokens, per-tenant API keys, OAuth credentials and JSON-RPC payloads could be written to server logs.

Our coverage

No articles linked to this incident yet.

Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-42236
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-42449
  3. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-41495
  4. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-42282
  5. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-44694