CVE-2026-56360Network attack vector

Workflow data injection via missing webhook verification

Published Jul 8, 2026 · Updated Jul 8, 2026

Authentication bypass in n8n 1.x before 1.123.18 and 2.0.0 through 2.6.1 allows remote attackers to inject forged Zendesk webhook data. The ZendeskTrigger node accepts POST bodies without computing and verifying the HMAC-SHA256 signature attached by Zendesk. Exploitation requires an active Zendesk-triggered workflow and knowledge of its high-entropy webhook URL, after which crafted data can drive downstream workflow actions.

CVSS severity6.3
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in n8n 1.x before 1.123.18 and 2.0.0 through 2.6.1 allows remote attackers to inject forged Zendesk webhook data. The ZendeskTrigger node accepts POST bodies without computing and verifying the HMAC-SHA256 signature attached by Zendesk. Exploitation requires an active Zendesk-triggered workflow and knowledge of its high-entropy webhook URL, after which crafted data can drive downstream workflow actions.

The record

CVE
CVE-2026-56360
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
n8n
Product
n8n
Classifications
CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=0 <1.123.18
  2. Affected versionversion=2.0.0 <2.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

n8n · n8nversion=0 <1.123.18; version=2.0.0 <2.6.2

Published CVSS scores

6.3n8nCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
4.0n8nCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1190Exploit Public-Facing Application

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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