n8n: N8n before 1.123.15 and 2.5.0 contains a webhook forgery vulnerability in the GitHub Webhook…
n8n
- Severity
- Medium, CVSS 5.3
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Record
- CVE-2026-56357
- Affects
- n8n
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- June 22, 2026
- Source last modified
- June 24, 2026
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.
Description quoted from the NVD record.