CVE-2025-54590

CVE-2025-54590 affects webfinger.js (TypeScript WebFinger client). In versions 2.8.0 and earlier, the lookup function did not block localhost access (only basic localhost checks), enabling blind SSRF via crafted host/port/path in user addresses. Affected environments include browser and Node.js. ...

CVE-2025-54590 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...