A few years ago, Zero Trust was mainly a topic for large enterprises. In 2026 it is simply how modern security works. Attackers rarely “break in” anymore: they log in with stolen credentials, abuse a trusted supplier, or exploit an unpatched device facing the internet. Zero Trust assumes that any of this can happen and is designed to limit the damage when it does.
1. What Zero Trust Means Today
Zero Trust is a security model in which no user, device or network is trusted by default, whether it is inside or outside the office. Every access request is checked against identity, device health and risk. Users receive only the access they need, and the system is designed on the assumption that a breach is possible. The approach is defined in NIST SP 800-207 and is now built into mainstream platforms such as Microsoft 365 and Google Workspace.
2. Identity Is the New Perimeter
With people working from anywhere and most applications in the cloud, the user account has become the main security boundary. Basic SMS or app codes are no longer enough against modern phishing kits that steal sessions in real time.
Example Solution:
Use phishing-resistant MFA (passkeys, FIDO2 security keys or Windows Hello for Business), block legacy authentication, and use conditional access policies that consider location, device and sign-in risk.
3. Only Healthy Devices Get Access
A valid password on an infected or outdated laptop is still a risk. Zero Trust checks the device as well as the user. This matters even more since Windows 10 reached end of support on 14 October 2025: unsupported computers should not have access to company data.
Example Solution:
Manage devices centrally (for example with Microsoft Intune), require encryption, current updates and endpoint protection, and allow access to company data only from compliant devices.
4. Least-Privilege Access Instead of Flat Networks
Traditional VPNs often give users access to the whole network once they connect. According to the Verizon 2026 DBIR, exploiting vulnerabilities is now the most common way into organisations, and internet-facing devices such as VPN gateways are frequent targets.
Example Solution:
Segment the network, publish applications through zero-trust network access (ZTNA) instead of broad VPN access, use separate admin accounts with just-in-time privileges, and never expose management interfaces to the internet.
5. Continuous Monitoring and Fast Response
Zero Trust does not end at login. Sign-in logs, device signals and alerts must be watched continuously so that suspicious activity is stopped quickly. For companies covered by Bulgaria’s NIS2 rules, a 24-hour early warning for significant incidents is only possible if you detect them in time.
Example Solution:
Centralise logs and alerts, enable risk-based sign-in protection, and keep an incident response plan with clear roles and contacts.
Where to Start
Zero Trust is a journey, not a product. For most small and mid-sized businesses, the first steps deliver the biggest gain: MFA for every account, an inventory of devices and applications, conditional access, separate admin accounts, and tested backups.
IT Engineering helps companies design and implement Zero Trust step by step on Microsoft 365, Azure and Google Workspace. Contact us to plan your next step.
Sources: NIST SP 800-207 Zero Trust Architecture; Verizon 2026 DBIR (Help Net Security summary).
