Vulnerability · Published Aug 21, 2025 · Assigned by GitHub_M
CVE-2025-57755claude-code-router CORS. misconfiguration
High 8.1
In plain English
A high-severity information exposure in claude-code-router from musistudio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
claude-code-router is a powerful tool to route Claude Code requests to different models and customize any request. Due to improper Cross-Origin Resource Sharing (CORS) configuration, there is a risk that user API Keys or equivalent credentials may be exposed to untrusted domains. Attackers could exploit this misconfiguration to steal credentials, abuse accounts, exhaust quotas, or access sensitive data. The issue has been patched in v1.0.34.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @musistudio/claude-code-router | 1.0.34 | GHSA-8hmm-4crw-vm2c |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| musistudio | claude-code-router | < 1.0.34 |
Weakness: CWE-200, CWE-942 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U