- mask API keys in usage stats/history responses (apiKeyMasked)
- validate proxy URL scheme + reject shell metachars before env write
- escape HTML in OAuth callback page to prevent XSS
- atomic O_EXCL lock file to prevent TOCTOU race in MITM startServer
- set mitmIsRestarting guard synchronously before any await
Co-authored-by: Cursor <cursoragent@cursor.com>