Description
n8n is an open source workflow automation platform. From 1.36.0 to before 2.2.0, the Webhook node’s IP whitelist validation performed partial string matching instead of exact IP comparison. As a result, an incoming request could be accepted if the source IP address merely contained the configured whitelist entry as a substring. This issue affected instances where workflow editors relied on IP-based access controls to restrict webhook access. Both IPv4 and IPv6 addresses were impacted. An attacker with a non-whitelisted IP could bypass restrictions if their IP shared a partial prefix with a trusted address, undermining the intended security boundary. This vulnerability is fixed in 2.2.0.
Problem types
CWE-134: Use of Externally-Controlled Format String
CWE-284: Improper Access Control
Product status
References
github.com/...io/n8n/security/advisories/GHSA-w96v-gf22-crwp
github.com/n8n-io/n8n/issues/23399
github.com/n8n-io/n8n/pull/23399
github.com/...ommit/11f8597d4ad69ea3b58941573997fdbc4de1fec5