CVE-2026-59207Network attack vector

Credential exfiltration via unenforced MCP domain restrictions

Published Jul 9, 2026 · Updated Jul 9, 2026

Credential exposure in n8n before 2.27.4 or 2.28.0 allows remote authenticated users to send shared secrets to external servers. The AI Agents MCP connector sends a selected shared credential to an arbitrary tool URL without applying its Allowed HTTP Request Domains restriction. Exploitation requires the agents module, a domain-restricted credential shared use-only with a member-level user, and permission to run an agent; it discloses that credential to an attacker-controlled server.

CVSS severity7.1
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in n8n before 2.27.4 or 2.28.0 allows remote authenticated users to send shared secrets to external servers. The AI Agents MCP connector sends a selected shared credential to an arbitrary tool URL without applying its Allowed HTTP Request Domains restriction. Exploitation requires the agents module, a domain-restricted credential shared use-only with a member-level user, and permission to run an agent; it discloses that credential to an attacker-controlled server.

The record

CVE
CVE-2026-59207
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
n8n
Product
n8n
Classifications
CWE-693, T1555
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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=< 2.27.4
  2. Affected versionversion=>= 2.28.0, < 2.28.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

n8n · n8nversion=< 2.27.4; version=>= 2.28.0, < 2.28.1

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
7.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA: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.

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

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-693Protection Mechanism Failure
T1555Credentials from Password Stores

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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