CVE-2025-57755: Musistudio Claude-Code-Router

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Musistudio Claude-Code-Router: before 1.0.34 (fixed in 1.0.34)

Published 2025-08-21. Last modified 2026-06-17.