CVE-2026-56360

EUVD-2026-42258
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
4 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 8.46%
Affected Products (NVD)
VendorProductVersion
n8nn8n
𝑥
< 1.123.18
n8nn8n
2.0.0 ≤
𝑥
< 2.6.2
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq
https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-zendesktrigger