CVE-2026-56360
6.3
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| n8n | n8n | 0 < 1.123.18 | affected |
| n8n | n8n | 1.123.18 | unaffected |
| n8n | n8n | 2.0.0 < 2.6.2 | affected |
| n8n | n8n | 2.6.2 | unaffected |
Weaknesses
- CWE-290: Authentication Bypass by Spoofing
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
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
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