CVE-2026-45582Network attack vector

Telemetry disclosure via incomplete URL-field redaction

Published May 29, 2026 · Updated May 29, 2026

Sensitive information exposure in n8n-MCP before 2.51.3 allows remote authenticated users to send URL parameter fragments to telemetry. The WorkflowSanitizer replaced only URL hostnames with [domain], leaving paths and query strings intact when serializing workflow telemetry. Workflow creation or editing access is required, and exposure is limited to partial URL-shaped parameter values readable by telemetry-backend operators.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in n8n-MCP before 2.51.3 allows remote authenticated users to send URL parameter fragments to telemetry. The WorkflowSanitizer replaced only URL hostnames with [domain], leaving paths and query strings intact when serializing workflow telemetry. Workflow creation or editing access is required, and exposure is limited to partial URL-shaped parameter values readable by telemetry-backend operators.

The record

CVE
CVE-2026-45582
Published
May 29, 2026
Updated
May 29, 2026
Vendor
Ai Advisors Romuald Czlonkowski
Product
n8n-MCP
Classifications
CWE-201
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 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=< 2.51.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ai Advisors Romuald Czlonkowski · n8n-MCPversion=< 2.51.3

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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