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CVE-2026-56360

n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTrigger

MEDIUM
4
CVSS Score
Published: July 8, 2026 at 01:49 PM UTC
Updated: October 25, 2026 at 08:10 PM UTC
1 product affected across 1 vendorN8N

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Severity
MEDIUM4
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

n8n before versions 1.123.18 and 2.6.2 fails to verify HMAC-SHA256 signatures on Zendesk webhooks in the ZendeskTrigger node. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary malicious data.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

N8N· N8Nnpm
95%
v < 1.123.182.0.0 ≤ v < 2.6.22.0.0
Vendor states this is fixed in 1.123.18 (unaffected)
Vendor states this is fixed in 2.6.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryMitigation
Source: cverecord
https://github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-zendesktrigger

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4MEDIUMVulnCheck
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-290

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