What Cybersecurity Risks Are Construction Companies Most Vulnerable To?

Construction companies with 10-25 employees face 6 primary cybersecurity risks, largely due to remote job sites, shared devices, and cloud-based tools like Procore and Microsoft 365. In recent years, phishing attacks, ransomware, and compromised credentials have become the most common causes of downtime, with the average small-business breach costing $25,000-$120,000 in recovery, lost productivity, and project delays. Because construction teams work across offices, job sites, and mobile devices, cybersecurity must be designed specifically for distributed, fast-moving environments, not generic office setups.

Construction companies face unique cybersecurity risks due to their reliance on cloud-based tools, mobile devices, and distributed job sites. They are especially vulnerable to phishing and email-based attacks that target busy staff, as well as ransomware and malware that can halt projects and lock down critical data. Lost or stolen devices from job sites, weak access controls for cloud platforms, and unsecured job site networks further increase exposure, making it easier for attackers to gain unauthorized access. Understanding these common threats is the first step toward protecting both operations and project timelines.

Phishing & Email-Based Attacks

Phishing remains the number one cyber threat to construction companies. Attackers commonly use fake invoices, wire fraud requests, and vendor impersonation emails to trick employees into sending payments or revealing login credentials. Construction firms are frequent targets because of high transaction volumes, tight deadlines, and constant communication with vendors and subcontractors. Project managers and accounting teams are especially at risk, as compromised email accounts can lead to fraudulent payments, altered job costing data, and unauthorized access to project systems.

Ransomware & Malware

Ransomware often enters construction environments through job site laptops, tablets, or personal devices that connect to company systems without proper security controls. Once inside, malware can encrypt project files, disrupt schedules, halt billing, and lock teams out of critical applications like Procore. While backups are essential, they are not enough on their own. Modern ransomware can target backups directly or exploit delays in recovery, leading to extended downtime and missed project deadlines.

Lost or Stolen Devices from Job Sites

Construction crews rely heavily on laptops, tablets, and phones in the field, and those devices are frequently lost or stolen from vehicles, trailers, or job sites. When devices aren’t encrypted or centrally managed, sensitive project data, credentials, and client information can be exposed. Device tracking, encryption, and remote wipe capabilities are critical for minimizing risk when hardware goes missing and for preventing unauthorized access to company systems.

Weak Access Controls for Cloud Tools

Many construction companies still rely on shared logins for cloud platforms like Procore or Microsoft 365, creating serious security gaps. The lack of multi-factor authentication for remote workers increases the risk of account takeovers, especially when credentials are stolen through phishing. Another common issue is former employees or subcontractors retaining access long after their role ends, leaving systems exposed to misuse or accidental data leaks.

Unsecured Job Site Networks

Temporary job site internet connections and mobile hotspots are often deployed quickly and with little security planning. Public or shared Wi-Fi networks expose traffic to interception, credential theft, and unauthorized access. Attackers can exploit weak job site networks to move laterally into cloud systems, email accounts, and file storage — turning a simple connectivity issue into a full-scale security incident. Securing job site networks is just as important as securing the office.

A 12-employee construction company in the Burbank, CA area experienced a phishing attack that compromised a project manager’s Microsoft 365 account, exposing files and financial data. After implementing multi-factor authentication (MFA), endpoint security, employee training, and 24/7 monitoring, the company eliminated successful phishing incidents and avoided an estimated $25,000+ in potential losses within 90 days.