Cloud Vulnerability Scanner
Fast, accurate and free online cloud vulnerability scanner tool running directly in your browser.
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Cloud Vulnerability Scanner
This tool performs a non-invasive test of selected cloud resources (such as S3/GCS buckets) for public access and object listing. The analysis relies solely on HTTP/HTTPS requests to the specified resource. Use it only on your own environments or where you have formal permission.
The tests found no clear signs of a public listing or obvious misconfiguration. Remember that this is a quick heuristic test and does not replace a full audit.
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Other tools you may find usefulCloud Vulnerability Scanner - safe checking of resources in the cloud
Cloud Vulnerability Scanner is a simple online tool that, with one click, checks whether a given cloud resource (e.g. bucket or URL address in AWS S3, Azure Blob, Google Cloud Storage or another provider) is not accidentally exposed to the world, whether it is impossible to display a list of files or view sensitive data without logging in and without additional permissions.
How Cloud Vulnerability Scanner works in practice
The tool's interface is intentionally as simple as possible, because most of the work is done by the scanner engine, which builds various address variants underneath, sends controlled HTTP requests and analyzes the responses in terms of characteristic patterns such as object listings, "Index of" pages, and messages confirming the correct access restriction. Thanks to this, you can check in a few seconds whether a given bucket or cloud resource behaves as it should from a security point of view.
- You enter the URL of the cloud resource or the bucket name like my bucket name or bucket.s3.amazonaws.com.
- You set the request timeout (timeout), which is safe by default and avoids the scanner hanging.
- You enable or disable options for detecting public object listings and directory indexing.
- You run the scan and after a while you receive a clear summary with the classification of the answers.
- Additionally, you can view a fragment of the response content that helped classify a given address variant.
What exactly does the Cloud Vulnerability Scanner test
Cloud Vulnerability Scanner focuses on the common places where configuration errors most often occur in cloud environments. The tool checks, among other things, whether the bucket or resource responds in a way that suggests a public file listing, whether the server does not generate pages indexing the contents of directories, and whether the visible HTTP response codes are consistent with the access policy you want to have set for your organization and your data.
In practice, this means a quick sanity check of the cloud configuration - without the need to install agents, write scripts or use complex administration consoles.
What cloud scenarios does the tool support?
The interface is universal, so you can use one scanner to test buckets in AWS S3, resources in Azure Blob Storage, and objects in Google Cloud Storage or other compatible file storage services. In many cases, it is enough to simply paste the URL you already use, or the name of a bucket running in your infrastructure, and the scanner will take care of matching the appropriate variants to detect potentially risky behavior.
Cloud Vulnerability Scanner highlights step by step
Although Cloud Vulnerability Scanner works quite cleverly in the background, from a user's perspective it all comes down to a few clean interface elements that have been designed so that the tool can be used by both security administrators and devops, as well as less technical people responsible for data protection in the company.
Target field - address or bucket
In the main field of the form, enter the URL of the cloud resource you want to test, or the name of the bucket that meets typical naming rules, i.e. regular letters, numbers, dots and dashes. The scanner checks the correctness of the format and if something is wrong, it immediately returns a clear message instead of random errors.
Such a pre-filter helps avoid mistakes and accidentally scanning something completely different than you expected, which is important both from the perspective of security and compliance with company policies.
Request timeout
You can adjust the server response timeout to suit your needs, for example leave the default value, which works well in most corporate networks, or increase it slightly if you know that your cloud environment is sometimes under load. Extreme values are filtered to avoid you accidentally setting the timeout impractically low or too high.
Public Object Listing Detection Option
When you enable the public listing detection option, the scanner will look for responses specific to situations in which a bucket or resource may reveal a list of files without additional authentication. This could be, for example, a typical XML or JSON response for object listing, or other recognizable formats that should not be accessible to an anonymous user.
These types of configuration errors are often exploited by people looking for easily accessible data in the cloud, so regularly testing your own resources is one of the easiest ways to increase the level of security.
Directory indexing detection option
The second switchable function checks whether the server does not generate pages like the classic "Index of", which present a list of files in a given directory or resource space. Such pages can be convenient in testing, but in a production environment they are usually undesirable because they make it easier to view the data structure for someone who should not have visibility into its layout.
How to interpret cloud scan results
Once the scan is complete, Cloud Vulnerability Scanner presents a summary including information about the target type, address variants used, heuristically recognized cloud provider, HTTP statuses, and response classification. Thanks to this, you can quickly decide whether the visible behavior is consistent with your expectations or whether it is worth reacting immediately and correcting the configuration.
| Classification | What does | mean in practice Recommended response |
|---|---|---|
| Public listing | The response looks like a list of objects or directories visible without logging in. | Verify permissions, ACL policies, and sharing rules for the cloud resource. |
| Access denied | The server returns an access denied message, which usually means that the restrictions are set correctly. | Most often everything is fine, but it is still worth repeating the control tests periodically. |
| Not found | The address or bucket was not found, which may indicate a typo or a disabled resource. | Check the correctness of the name and configuration on the cloud provider side. |
| OK no listing | The server responds correctly, but no typical file listing or directory indexes are detected. | Ensure that the server-side application also respects the principles of least privilege. |
| Error | A connection error or unusual status has occurred that does not fit into the classic categories. | It's worth checking the cloud-side logs and repeating the test to make sure there are no network issues. |
Why it is worth regularly scanning your organization's cloud resources
In cloud environments, the configuration can change very quickly because subsequent services are added by different teams, automatic scripts and CI pipelines or external providers, which in practice means that the risk of accidentally disclosing data to the public is real even in companies that have extensive paper security procedures. A simple online cloud vulnerability scanner is therefore an easy way to add an additional layer of control that you can apply ad hoc, without involving the entire IT department.
Inspection before deploying to production
Before moving a new application or service to the production environment, just run the Cloud Vulnerability Scanner on the key buckets and URLs that will be used, and you will quickly check whether there are any symptoms of potential data exposure, such as file listings or directory indexing visible to an anonymous Internet user.
Periodic cloud security reviews
Nothing prevents scanning of cloud resources from becoming an element of a quarterly or monthly security review, which you can automate at the level of procedures in the organization, supplementing it with more extensive audits and compliance tests with industry regulations.
Cloud Vulnerability Scanner for various roles in the company
The tool has been designed not to be limited only to security specialists, so it can be successfully used by people responsible for data, product owners, team leaders, and even marketing or sales, as long as they manage their own resources in the cloud, for example files to download for customers.
Security and DevOps
Quick sanity check of bucket configuration and resources used by applications, without the need to log in to each cloud separately and click through complex management panels.
Product Owners
Ability to verify that materials made available to users are exposed only as planned in the product's business logic.
Smaller teams and freelancers
A simple way to check your cloud configuration without having to go deep into the provider's documentation and learn all the nuances of access policies.
FAQ - frequently asked questions about the cloud vulnerability scanner
Is Cloud Vulnerability Scanner safe for my data
Yes, the tool works based on standard HTTP queries and does not attempt to perform any destructive operations on the resource. The purpose is only to check how the server and cloud configuration responds to normal requests that any network user could send, therefore the scanner is neutral and does not modify data.
Can I scan any resources on the Internet
No, Cloud Vulnerability Scanner should only be used to test resources for which you have full administrative rights or the owner's explicit consent to perform such a test. Scanning other people's resources without consent may violate terms of service and local regulations, so always focus on your own infrastructure or test environments provided for security purposes.
How often should you repeat a cloud scan
It is a good idea to run the scanner every time you implement a new project in the cloud or significantly change the configuration of existing buckets, as well as periodically, for example monthly or after major changes in the team, when new people gain access to the administration panels of cloud providers.
Does the tool show ready-made solutions to problems
Cloud Vulnerability Scanner focuses on detecting symptoms of potential data exposure, while specific remediation steps depend on the cloud provider, the services used and the security policies in your organization. The report from the tool is an ideal starting point for the security team or administrators who will make configuration decisions based on it.
Test your bucket in the cloud before someone else does
Paste the resource address, select scanning options and run Cloud Vulnerability Scanner to check in a few seconds whether the data in your cloud is not accidentally publicly available. This is a quick step that can protect your organization from unnecessary information leakage.