Server-side Request Forgery (SSRF) Affecting webfinger.js package, versions <2.8.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-WEBFINGERJS-11345662
- published1 Aug 2025
- disclosed28 Jul 2025
- creditOri Hollander
Introduced: 28 Jul 2025
NewCVE-2025-54590 (opens in a new tab)How to fix?
Upgrade webfinger.js to version 2.8.1 or higher.
Overview
webfinger.js is an A client library to query WebFinger records
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the WebFinger class. An attacker can cause the server to send arbitrary GET requests to internal or external hosts, including localhost and LAN addresses, by supplying a specially crafted user address.
Note: This is a Blind-SSRF and the response of the request it not returned to the user.
PoC
curl "http://localhost:3000/api/v1/search_user?search=user@localhost:1234/secret.txt?"