Google Cloud Functions can be secured using Identity and Access Management (IAM) roles, which control who has access to your functions. Assign least privilege IAM roles to users, only granting necessary permissions. Use environment variables for sensitive data instead of hard-coding them in the function. Enable VPC Service Controls to protect against data exfiltration. Regularly audit logs with Cloud Audit Logs for unusual activity. Implement Cloud Security Scanner to identify vulnerabilities. Always keep your dependencies up-to-date to avoid known security issues.
