CVE-2026-56360 n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTrigger

What is CVE-2026-56360?

CVE-2026-56360 is a medium-severity missing authorization vulnerability in N8n N8n, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-290

Which versions are affected by CVE-2026-56360?

4 open source packages ship an affected version, including n8n. It affects 1 product.

Products include N8n N8n.

How do I fix CVE-2026-56360?

Upgrade n8n to a fixed version for your release line: 1.123.18 or 2.6.2.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-56360 being exploited?

There is no known exploitation of CVE-2026-56360 in the wild and no public exploit code.

Other vulnerabilities in N8n N8n

• CVE-2025-68613 n8n Improper Control of Dynamically-Managed Code Resources Exploited Critical 10.0
• CVE-2026-21877 n8n is vulnerable to Remote Code Execution via Arbitrary File Write Critical 10.0
• CVE-2026-21858 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling Critical 10.0
• CVE-2026-1470 n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution Critical 9.9
• CVE-2025-68668 n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node Critical 9.9

All N8n N8n vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-38c7-23hj-2wgq, GHSA-wgjf-2hg5-2533.