CVE-2025-54590Public exploitNetwork attack vector

Blind SSRF via unchecked WebFinger address parsing

Published Aug 1, 2025 · Updated Aug 1, 2025

SSRF in Silverbucket webfinger.js 2.8.0 and earlier allows remote attackers to make server-side GET requests to internal services. The lookup function treats everything after the first @ as the host, fails to reject loopback or private addresses, and embeds attacker-controlled path and port text into the request URL. Exploitation requires a server-side application to pass an attacker-controlled address to lookup; responses remain blind, but known internal GET endpoints become reachable.

CVSS severity6.9
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Silverbucket webfinger.js 2.8.0 and earlier allows remote attackers to make server-side GET requests to internal services. The lookup function treats everything after the first @ as the host, fails to reject loopback or private addresses, and embeds attacker-controlled path and port text into the request URL. Exploitation requires a server-side application to pass an attacker-controlled address to lookup; responses remain blind, but known internal GET endpoints become reachable.

The record

CVE
CVE-2025-54590
Published
Aug 1, 2025
Updated
Aug 1, 2025
Vendor
Silverbucket
Product
webfinger.js
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Silverbucket · webfinger.jsversion=< 2.8.1

Published CVSS scores

6.9GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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