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The vulnerability of the MCP Client Registration mechanism of the N8n platform, which is used for automating work processes, allows a perpetrator to trigger a service failure.
🗓️ 18 May 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec🔗 bdu.fstec.ru👁 3 Views
| Reporter | Title | Published | Views | Family All 16 |
|---|---|---|---|---|
 | CVE-2026-42236 | 4 May 202618:38 | – | attackerkb |
 | CVE-2026-42236 | 4 May 202620:56 | – | circl |
 | n8n 安全漏洞 | 4 May 202600:00 | – | cnnvd |
 | CVE-2026-42236 | 4 May 202618:38 | – | cve |
 | CVE-2026-42236 n8n: Unauthenticated Denial of Service via MCP Client Registration | 4 May 202618:38 | – | cvelist |
 | EUVD-2026-27111 | 4 May 202618:38 | – | euvd |
 | n8n Vulnerable to Unauthenticated Denial of Service via MCP Client Registration | 29 Apr 202621:19 | – | github |
 | CVE-2026-42236 | 4 May 202619:16 | – | nvd |
 | CVE-2026-42236 n8n: Unauthenticated Denial of Service via MCP Client Registration | 4 May 202618:38 | – | osv |
| GHSA-49M9-PGWW-9VQ6 n8n Vulnerable to Unauthenticated Denial of Service via MCP Client Registration | 29 Apr 202621:19 | – | osv |
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18 May 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 37.5
CVSS 27.8
EPSS0.00487