Data exfiltration through "screenshots" and personal devices

48% of companies have suffered security breaches caused by personal devices over the last year, and more than 75% of incidents continue to be linked to human error.

The impact is growing rapidly: the average cost of a data breach for Spanish companies has already reached $3.9 million. Relying only on traditional defenses is no longer enough to protect critical information and ensure business continuity.

What is data exfiltration through screenshots and personal devices?

A data breach can occur due to a cyberattack, a technical failure, or human error. In many cases, information leaks do not happen through advanced techniques, but through everyday actions such as saving screenshots containing sensitive data or taking photos of screens with personal devices to share information outside the corporate environment.

The main risk is that these practices bypass many traditional Data Loss Prevention (DLP) systems. Since they occur through personal devices, external networks, or tools not controlled by the company, they have become one of the most common ways critical information is exposed.

How to detect this type of information leak before it becomes critical

Detecting when someone takes a photo of a screen is technically very difficult at the external hardware level, but the user’s behavior before and after the action always leaves an auditable digital trace. Implementing monitoring systems and early warning protocols makes it possible to react before the damage spreads.

Early detection is based on identifying unusual access patterns, massive downloads, or abnormal movements of sensitive information. Solutions like WWatcher make it possible to analyze who is accessing the data, from where, and what volume is being handled, helping detect patterns associated with potential information leaks through screenshots or non-corporate devices.

Steps to respond and contain data exposure

Knowing how to act from the very beginning can make the difference between a controlled incident and a corporate crisis. The first 72 hours are critical to contain the information leak, assess its impact, and comply with data protection regulations.

• Identify and contain the incident: The first step is understanding what happened and stopping it immediately by blocking compromised access, isolating affected devices, changing passwords, and disconnecting critical systems.
  
  
• Assess the risk and impact: Analyze in detail what data has been affected, how many people are involved, and whether the exposed information includes sensitive data.
  
  
• Limit access and prioritize: Not all breaches carry the same level of risk. Prioritizing according to severity is essential for making fast and accurate decisions. It is also critical to limit access based on each user’s role moving forward, avoiding unnecessary permissions.
  
  
• Notify and document the incident: Recording everything that happened and reporting the breach when required is key to complying with current regulations. In cases involving personal data, the company may be legally required to notify the relevant authority and affected individuals within established deadlines.

Cybersecurity strategies to prevent incidents through devices

Preventing data exposure requires protecting information from its source and limiting any unnecessary access. These are some of the most effective measures to reduce the risk of information leaks through screenshots or non-corporate devices:

Apply Zero Trust models

The Zero Trust model removes implicit trust within the corporate network. Every access request must be continuously validated based on the user’s identity, the device being used, the location, and the connection’s risk level. This helps detect suspicious access and reduce unauthorized movement within the infrastructure.

Encrypt sensitive information

Encryption protects data so it cannot be interpreted even if someone gains unauthorized access. Applying encryption across devices, servers, backups, and internal communications adds a critical layer of protection against information leaks.

Restrict access and permissions

Many incidents occur because users have access to more information than necessary. Limiting permissions according to each employee’s role reduces the exposure surface and makes it more difficult for an internal breach to compromise large volumes of sensitive data.

Use secure devices and networks

Accessing company resources through public networks, personal devices, or insecure connections significantly increases risk. Using VPNs, protected networks, and company-managed devices helps maintain greater control over activity and minimize unsupervised external access.

Implement MDM solutions

Mobile Device Management (MDM) systems make it possible to apply security policies across corporate phones, tablets, and laptops. Among other features, they allow companies to block screenshots in critical applications, restrict unauthorized installations, and remotely control compromised devices.

Perform regular cybersecurity audits

Regularly reviewing access permissions, configurations, internal practices, and information flows helps identify vulnerabilities before they are exploited. Audits make it possible to detect poor practices, correct operational weaknesses, and strengthen the protection of the company’s critical data.

ESED, proactive cybersecurity for your company

At ESED, we work with a fixed monthly fee that includes proactive services designed to keep systems protected and operational continuously. This model allows companies to anticipate security incidents and reduce dependence on reactive actions or unexpected costs.

In addition, you can assess your company’s level of preparedness against cyberattacks through our cybersecurity assessment test. No advanced technical knowledge is required, and it consists of 36 questions based on industry standards, designed to identify the real level of exposure and security maturity.