CVE-2025-57755Network attack vector

Credential exposure via permissive cross-origin policy

Published Aug 21, 2025 · Updated Aug 21, 2025

CORS misconfiguration in musistudio Claude Code Router before 1.0.34 allows remote attackers to read API credentials across origins. The upstream advisory identifies an improper CORS policy but does not disclose the affected handler, accepted origins, or response headers. A malicious origin must reach the gateway; successful access exposes credentials and enables account, data, or quota abuse.

CVSS severity8.1
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CORS misconfiguration in musistudio Claude Code Router before 1.0.34 allows remote attackers to read API credentials across origins. The upstream advisory identifies an improper CORS policy but does not disclose the affected handler, accepted origins, or response headers. A malicious origin must reach the gateway; successful access exposes credentials and enables account, data, or quota abuse.

The record

CVE
CVE-2025-57755
Published
Aug 21, 2025
Updated
Aug 21, 2025
Vendor
musistudio
Product
Claude Code Router
Classifications
CWE-942, CWE-200
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=< 1.0.34

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

musistudio · Claude Code Routerversion=< 1.0.34

Published CVSS scores

0.0musistudioCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
8.1GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-942Permissive Cross-domain Policy with Untrusted Domains
CWE-200Exposure of Sensitive Information to an Unauthorized Actor

Public exploit references

No public exploit references are available in this record.

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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