Medium severity · published Jul 8, 2026
CVE-2026-56360
n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTrigger
4.0
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N8
n8n · n8n
before 1.123.18; 2.0.0 before 2.6.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56360
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56360
Mitigation
https://github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq
Third Party Advisory
https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-zendesktrigger
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