CVE-2025-54590

MEDIUM EPSS 43.1%
Published Aug 1, 202511mo ago · Modified Jun 17, 20261w ago
6.9 CVSS 4.0
Medium
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Published Aug 1, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
43.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

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

References 3

  • github.com https://github.com/silverbucket/webfinger.js/commit/b5f2f2c957297d25f4d76072963fccaee2e3095a
  • github.com https://github.com/silverbucket/webfinger.js/releases/tag/v2.8.1
  • github.com https://github.com/silverbucket/webfinger.js/security/advisories/GHSA-8xq3-w9fx-74rv

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.