n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the GitHub Trigger generated a webhook secret but discarded it when GitHub returned HTTP 422 and the node reused an existing webhook. Workflow static data then retained webhookId without webhookSecret, and X-Hub-Signature-256 verification accepted deliveries without a stored secret.
The affected logic includes packages/nodes-base/nodes/Github/GithubTriggerHelpers.ts and the 422 webhook reuse path. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76
security-advisories@github.com
https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7
security-advisories@github.com
https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2
security-advisories@github.com
https://github.com/n8n-io/n8n/security/advisories/GHSA-5m98-cgcr-xx3q
security-advisories@github.com