Weekly Cybersecurity Digest [May, Week 5]
Posted on June 2, 2026
Dear Valued Clients,
Welcome to this week’s cybersecurity digest from Make Sense, your trusted partner in building measurable resilience across Europe’s digital, operational, and regulatory ecosystems. This week’s developments highlight three themes shaping the European cyber landscape: the disruption of large-scale criminal infrastructure, growing concern over identity and access-layer vulnerabilities, and increasing recognition that cyber resilience is now a strategic national and economic priority.
From the takedown of a botnet spanning millions of devices to active exploitation of critical enterprise vulnerabilities and warnings about state-backed cyber activity, organisations are facing threats that move quickly across interconnected systems. At the same time, regulators, governments, and critical sectors are accelerating efforts to strengthen resilience through investment, cooperation, and emerging technologies such as AI.
The challenge for organisations is no longer simply preventing attacks. It is ensuring they can identify exposure early, respond effectively, and maintain operational continuity when disruption affects the systems, suppliers, and services they depend on most.
✅ Top Stories of the Week
i. Dutch Authorities Disrupt Botnet Of 17 Million Infected Devices
Dutch authorities disrupted a major botnet made up of at least 17 million infected devices and seized more than 200 servers hosted in the Netherlands. The infrastructure was reportedly used to control compromised computers, tablets, and smartphones for cyberattacks. The operation highlights the growing role of proxy and botnet ecosystems in scaling cybercrime — and why infrastructure visibility is becoming essential for European threat monitoring. [Read more via BleepingComputer]
ii. Spain Arrests Suspect Accused Of Leaking Sensitive Government-Employee Data
Spanish police arrested an individual accused of leaking sensitive personal data connected to major state entities, including INCIBE, the National Police, the Civil Guard, the State Attorney General’s Office, and the National Security Council. Authorities said the leak carried national security risks because of the people and institutions exposed. The case highlights the growing impact that data exposure and doxing incidents can have on public-sector security and trust. [Read more via BleepingComputer]
iii. Critical Windows Netlogon RCE Flaw Now Exploited In Attacks
Belgium’s Centre for Cybersecurity warned that attackers are actively exploiting a critical Windows Netlogon remote-code execution vulnerability affecting supported Windows Server versions. Because Netlogon is central to domain authentication, exploitation could expose domain controllers and internal networks. The warning underscores the importance of rapid patching and identity-layer resilience across enterprise environments. [Read more via BleepingComputer]
✅ Industry Trends & Insights
GCHQ Signals A Shift Toward AI-Powered National Cyber Defence
GCHQ’s Director used the agency’s first Annual Lecture at Bletchley Park to warn that the UK and its allies face a narrowing window to stay ahead of hostile cyber and technology threats. The speech also pointed to a future national cyber defence capability using agentic AI to detect and respond faster than human operators. The trend is clear: AI is becoming both a defensive accelerator and a threat-speed multiplier. [Read more via GCHQ]
ENISA Finds Cybersecurity Maturity Improving — But Uneven Across Critical Sectors
ENISA’s latest NIS360 report found that cybersecurity maturity across EU high-criticality sectors is improving, helped by regulation, investment, and stronger cooperation. But progress remains uneven across sectors and within individual ecosystems. Banking, electricity, telecommunications, cloud, and data centres remain especially critical, while sectors such as public administration, health, and water still face maturity gaps that could affect operational resilience under stress. [Read more via ENISA]
Hidden Ransomware Incidents Are Distorting The Real Threat Picture
New reporting this week highlighted how many ransomware incidents still remain undisclosed, creating blind spots for regulators, insurers, security teams, and boards. If attacks are settled quietly or never reported, organisations lose visibility into attacker methods, sector exposure, and realistic loss patterns. This reinforces why reporting discipline, intelligence sharing, and post-incident transparency are becoming strategic requirements — not just compliance exercises. [Read more via TechRadar]
✅ Regulatory & Policy Updates
ECB Tells Eurozone Banks To Invest More In AI-Driven Cyber Risk
The European Central Bank warned eurozone banks that they need stronger cybersecurity investment to respond to risks created by advanced AI models capable of finding software flaws. The message is especially relevant for institutions still running complex legacy systems. For financial organisations, cyber investment is moving from a discretionary security spend to a structural resilience requirement tied to supervision, stability, and operational continuity. [Read more via Reuters]
Spain Pushes To Keep National Control Over Foreign Telecom Supplier Restrictions
Spain said EU member states should retain decision-making power over whether foreign telecom providers can be excluded from national infrastructure projects, even as Europe considers stronger cybersecurity rules. The position reflects a wider policy tension: Europe wants harmonised cyber resilience, but national governments still want sovereignty over telecom security, supplier risk, and strategic infrastructure decisions. [Read more via Global Banking & Finance Review]
UK And Poland Sign Security Treaty With Cyber Cooperation At Its Core
The UK and Poland signed a new Security and Defence Partnership Treaty aimed at deepening cooperation against hostile threats across Europe. The agreement includes projects across defence, technology, resilience, and security cooperation. In cyber terms, it reflects Europe’s growing recognition that digital defence, geopolitical risk, and critical infrastructure protection now sit within the same strategic conversation. [Read more via GOV.UK]
✅ Cyber IQ Challenge + Proactive Security Hacks
Quick Quiz:
What is the strongest operational lesson from this week’s cybersecurity developments?
A) Cyber risk is mainly caused by weak employee passwords
B) AI security only matters to technology companies
C) Shared infrastructure, access systems, and suppliers can quickly become attack pathways
D) Cybersecurity maturity is now equal across all critical sectors
(Answer below)
Smart Security Moves of the Week:
- Access infrastructure review: Check VPN, firewall, and remote-access configurations for exposed or vulnerable services.
- Botnet exposure monitoring: Watch for unusual outbound traffic, proxy abuse, and compromised endpoints communicating with suspicious infrastructure.
- AI-risk governance: Assess how AI could accelerate vulnerability discovery, phishing, fraud, or incident-response pressure.
- Critical-sector maturity check: Benchmark resilience across detection, recovery, supplier oversight, and board-level reporting — not only technical controls.
Answer: C) Shared infrastructure, access systems, and suppliers can quickly become attack pathways.
This week’s developments show that cyber disruption increasingly spreads through the systems organisations rely on most: identity services, connected devices, third-party infrastructure, and critical digital services.
✅ Conclusion
This week reinforces a central reality for European organisations: cyber resilience is increasingly determined by the security of interconnected systems rather than isolated assets. The disruption of a 17-million-device botnet, the exploitation of a critical Windows authentication vulnerability, and the exposure of sensitive government-related data all demonstrate how quickly cyber risk can scale when infrastructure, identities, or trusted systems are compromised.
At the same time, strategic signals from GCHQ, ENISA, the ECB, and European governments point in the same direction. AI is becoming a core component of both cyber defence and cyber risk, critical-sector resilience remains uneven, and cross-border cooperation is becoming essential to addressing threats that do not respect organisational or national boundaries.
Final reflection: If a critical identity service, supplier platform, or connected infrastructure component were compromised tomorrow, how quickly could your organisation identify the impact, contain the risk, and maintain operations?
At Make Sense, we help organisations translate cyber complexity into practical resilience — strengthening governance, operational continuity, supplier oversight, and security readiness across Europe’s evolving threat landscape.
Stay secure,
The Make Sense SRL Team & CyberTania
