CVE-2026-56357

Medium

Description

n8n before 1.123.15 and 2.5.0 contains a webhook forgery vulnerability in the GitHub Webhook Trigger node that fails to implement HMAC-SHA256 signature verification. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary data, spoofing GitHub webhook events.

SeverityMedium

CVSS4.0

Exploit probability—

Product

N8n

PublishedJun 22, 2026

First seenJun 22, 2026

Weakness typeCWE-290CWE-290

How to fix

Update

n8n n8n1.123.15, 2.5.0 or later
n8n1.123.15, 2.5.0 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-mqpr-49jj-32rc

Affected products

Product	Affected versions	Fixed in
n8n n8n	v < 1.123.15, 2.0.0 ≤ v < 2.5.0	1.123.15, 2.5.0
n8nnpm	v < 1.123.15, 2.0.0 ≤ v < 2.5.0	1.123.15, 2.5.0

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