CVE-2026-44694Network attack vector

Authenticated SSRF via unpinned DNS resolution

Published May 8, 2026 · Updated May 8, 2026

Server-side request forgery in n8n-MCP 2.18.7 through 2.50.1 allows remote authenticated users to read internal HTTP responses. Webhook trigger tools, the N8N_API_URL client, and multi-tenant x-n8n-url handling validate a resolved address but then let Axios perform a separate DNS lookup, leaving a rebinding window and bypassing the same gate on some client paths. An MCP session or prompt-controlled tool call is required; successful requests expose internal services or cloud metadata and return response bodies directly.

CVSS severity7.2
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in n8n-MCP 2.18.7 through 2.50.1 allows remote authenticated users to read internal HTTP responses. Webhook trigger tools, the N8N_API_URL client, and multi-tenant x-n8n-url handling validate a resolved address but then let Axios perform a separate DNS lookup, leaving a rebinding window and bypassing the same gate on some client paths. An MCP session or prompt-controlled tool call is required; successful requests expose internal services or cloud metadata and return response bodies directly.

The record

CVE
CVE-2026-44694
Published
May 8, 2026
Updated
May 8, 2026
Vendor
Ai Advisors Romuald Czlonkowski
Product
n8n-MCP
Classifications
CWE-367, CWE-918, T1552.005, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.18.7, < 2.50.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ai Advisors Romuald Czlonkowski · n8n-MCPversion=>= 2.18.7, < 2.50.2

Published CVSS scores

7.2GitHubCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L
9.1NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-918Server-Side Request Forgery (SSRF)
T1552.005Cloud Instance Metadata API
T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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