n8n has a Webhook Node IP Whitelist Bypass via Partial String Matching

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

使用外部控制的格式字符串

n8n 访问控制错误漏洞

n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 1.36.0版本至2.2.0之前版本存在访问控制错误漏洞，该漏洞源于Webhook节点的IP白名单验证执行部分字符串匹配而非精确IP比较，可能导致安全绕过。

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