webfinger.js is vulnerable to Blind SSRF attacks through localhost

webfinger.js is a TypeScript-based WebFinger client that runs in both browsers and Node.js environments. In versions 2.8.0 and below, the lookup function accepts user addresses for account checking. However, the ActivityPub specification requires preventing access to localhost services in production. This library does not prevent localhost access, only checking for hosts that start with "localhost" and end with a port. Users can exploit this by creating servers that send GET requests with controlled host, path, and port parameters to query services on the instance's host or local network, enabling blind SSRF attacks. This is fixed in version 2.8.1.

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服务端请求伪造(SSRF)

webfinger.js 代码问题漏洞

webfinger.js是Nick Jennings个人开发者的一个用于查询WebFinger记录的客户端库。 webfinger.js 2.8.0及之前版本存在代码问题漏洞，该漏洞源于未阻止localhost访问，可能导致盲SSRF攻击。

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