CVE-2025-54590

Description

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.

Reserved 2025-07-25 | Published 2025-08-01 | Updated 2025-08-01 | Assigner GitHub_M

Problem types

CWE-918: Server-Side Request Forgery (SSRF)

Product status

< 2.8.1
affected

References

github.com/...ger.js/security/advisories/GHSA-8xq3-w9fx-74rv

github.com/...ommit/b5f2f2c957297d25f4d76072963fccaee2e3095a

github.com/silverbucket/webfinger.js/releases/tag/v2.8.1

cve.org (CVE-2025-54590)

nvd.nist.gov (CVE-2025-54590)

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