CVE-2025-57755 claude-code-router CORS. misconfiguration
Improper CORS configuration in claude-code-router allows attackers to steal API keys and access sensitive data from untrusted domains.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-57755?
CVE-2025-57755 is a high-severity vulnerability in musistudio claude-code-router, published on 21 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2025-57755?
2 open source packages ship an affected version, including @musistudio/claude-code-router.
| Package | Affected | Fixed in |
|---|---|---|
@musistudio/claude-code-router npm | All versions | 1.0.34 |
@musistudio/claude-code-router npm | All versions | 1.0.34 |
How do I fix CVE-2025-57755?
Upgrade @musistudio/claude-code-router to 1.0.34 or later.
Is CVE-2025-57755 being exploited?
There is no known exploitation of CVE-2025-57755 in the wild and no public exploit code.
Sources
Also known as GHSA-8hmm-4crw-vm2c.