Bug Bounty Program

Cloud4Y welcomes you to disclose any vulnerability you find on our websites. Get a reward from $30 to $1000 per issue

Help us improve the security of our websites in exchange for a reward of $30 to $1,000 per case. Join our bug bounty program.

Security is an important part of our company's products, so we appreciate seeking out and disclosing our services' vulnerabilities. Inform Cloud4Y team about vulnerabilities on cloud4y.ru and cloud4u.com sites


  • Vulnerabilities on cloud4y.ru and cloud4u.com sites.
    Third-level domains *.cloud4y.ru, *.cloud4u.com/ are not part of the bugbounty program.
Submit a vulnerability
from $30 to $1,000

Submit a vulnerability

Please send any issues you identify to support_line37@cloud4y.ru. Include the following information:

A description of the issue
Detailed steps
allowyng us to reproduce the issue
Your name and contact
Wait for the review
Receive a reward and
a public acknowledgment

Keep details of vulnerabilities secret and do not share any information about them until we respond to you.

The researcher offering the first clear report will receive a reward.
Rewards are based on bug severity levels and the completeness of the report provided.

Program rules

  • Information security specialists review submissions within 12 business days.
  • Depending on the severity of the vulnerability, the reward ranges from $30 to $1,000.
  • In assessing vulnerabilities, we use our expert opinion and Vulnerability Rating Taxonomy .
  • Contacting tech support and submitting any forms that involve human processing is prohibited.
  • When searching for vulnerabilities, avoid violating the confidentiality and integrity of data as well as the availability of our services. It is prohibited to use automated tools for scans, and denial of service (DoS and DDoS) attacks. Also do not send SPAM to our users, engage in social engineering, and phishing of our employees and customers.
  • When researching, please use your own test accounts. Never take actions that could harm other users or violate their privacy.

Why trust Cloud4Y
13 years in cloud computing
Since 2009 the company has been successfully operating in the Russian and international cloud services markets.
Reliable infrastructure
4 TIER III data centers, Enterprise level hardware and software: HP, Cisco, Juniper, NetApp, VMware, Veeam, Microsoft, etc.
SLA 99.982%
Optical ring, MetroCluster and redundancy mechanisms guarantee fault tolerance of services up to SLA 99.99%.
Transparent Billing Options
Hourly billing and pay-as-you-go allow you to pay only for the resources consumed.
Geo-Distributed Backup
Automatic backup (14 restore points) in a separate remote data center.
Flexible scalability
You can add and reduce the amount of resources without need to contact technical support service.
24/7 technical support
If any technical issue occurs, our team of support experts is available round-the-clock, response time is 10 minutes.
Partner Program
Earn up to 35% of your annual contract. White Label is available.


Frequently asked questions (FAQ)

Find answers to your questions  in our knowledge base, ask our manager using online-chat or send an inquiry using the support ticket system.

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