Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/silverbucket/webfinger.js/commit/b5f2f2c957297d25f4d76072963f
- https://github.com/silverbucket/webfinger.js/releases/tag/v2.8.1
- https://github.com/silverbucket/webfinger.js/security/advisories/GHSA-8xq3-w9fx-
FAQ
What is CVE-2025-54590?
CVE-2025-54590 is a documented vulnerability. 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. H...
How severe is CVE-2025-54590?
CVSS scoring is not yet available for CVE-2025-54590. Check NVD for updates.
Is there a patch for CVE-2025-54590?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.