How to stop the use of unsecured attachments without hampering your teams’ productivity

In a professional environment where collaboration relies on rapid and continuous communication, document sharing has become essential. Every day, professionals receive an average of 50 email attachments. However, this trend comes with a growing risk: email attachments are now one of the most commonly exploited attack vectors. Indeed, it turns out that 68% of data breaches involve a human factor, a situation particularly conducive to man-in-the-middle attacks and targeted phishing campaigns. Faced with this threat, businesses must tackle a major challenge: how can they strengthen the security of communications without hindering the flow of work and day-to-day collaboration?

The risks associated with unsecured email attachments

Traditional email attachments represent a prime point of entry for cybercriminals, as they combine three major vulnerabilities: malware infection, increasingly sophisticated phishing campaigns, and the constant risk of sensitive data leaks.

These risks facing businesses were highlighted in October 2025 when opening an attachment containing ransomware led to the leak of personal data stored on the servers of more than 200 schools in the Hauts-de-France region. In light of the resurgence of these cyberattacks via email attachments, it is becoming essential to shift business practices towards secure file-sharing methods.

The devastating impact of cyberattacks

The consequences of a compromised email attachment can be severe. By 2025, the average cost of a data breach is estimated to reach $4.44 million. If we focus on attacks involving a malicious insider, the financial cost rises to $4.92 million and can even reach $5.08 million for ransomware attacks.

Beyond financial losses, businesses face business interruptions, significant remediation costs and the prolonged mobilisation of technical teams. The reputational impact is just as critical: a data breach permanently undermines the trust of customers and partners. Added to this are legal risks, notably the penalties provided for under the GDPR in cases of negligence. All these factors serve as a reminder of the importance of securing document exchanges.

Alternatives: towards smart and secure sharing

To mitigate these risks without hindering collaboration, organisations must adopt secure document-sharing tools. Using collaboration solutions hosted on sovereign clouds located within the country ensures that your company’s sensitive data is stored in a protected environment that is not subject to extraterritorial legislation.

Beyond simple storage, these tools enhance digital security through granular access management. The document is no longer sent: it remains in a secure space to which temporary and controlled access rights are granted. To guarantee confidentiality, these solutions must rely on end-to-end encryption and strong authentication. The secure link then replaces the attachment whilst ensuring that only the legitimate recipient can view the file.

Maintaining productivity through support

The success of this transition depends on user buy-in. Through training, staff must understand the challenges and benefits of the new tools.

During the roll-out phase, responsive technical support helps to quickly resolve issues and avoid frustration. Finally, clear internal communication helps to embed cybersecurity into the company culture and encourage the long-term adoption of best practices.

The risks associated with unsecured email attachments are now too significant to be ignored. Between malware, phishing and data leaks, organisations must modernise their sharing practices. By combining robust technologies (access control, encryption, strong authentication) with user support, they can secure their communications without sacrificing their agility. Modern collaboration must be seamless, mobile and, above all, secure to ensure the resilience of organisations in an increasingly complex digital landscape.