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Vulnerabilities

Vulnerability · CVE-2025-54590

webfinger.js is a TypeScript-based WebFinger client that runs in both browsers and Node.js environments.

Published Aug 1, 2025 · catalog updated Aug 1, 2025 · webfinger.js is a TypeScript-based

Check this week

CVE-2025-54590 is not in CISA KEV. FIRST estimates a 62.00% chance of exploitation in the next 30 days. Check whether you run webfinger.js is a TypeScript-based.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (webfinger.js is a TypeScript-based).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
62.00%
Remediation
Version ranges on file
Affected products
vendor silverbucket webfinger.js < 2.8.1

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, enab

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor silverbucket webfinger.js < 2.8.1< 2.8.1

How to fix CVE-2025-54590

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-54590 is not in CISA KEV. FIRST estimates a 62.00% chance of exploitation in the next 30 days. Check whether you run webfinger.js is a TypeScript-based.

Which versions are affected?

Compare what you have installed with silverbucket webfinger.js < 2.8.1 < 2.8.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 62.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 1, 2025 · EUVD

    Detected

    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

  2. Aug 1, 2025 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2025-54590

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-23378

    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 se

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Aug 1, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.