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Microsoft Purview eDiscovery is already built into your Microsoft 365 tenant, so the tools to preserve, search, and export email, files, and Teams messages are there before the first legal request. The trouble is learning them under deadline. Confirm licensing, assign the eDiscovery roles, and run a practice search now.
Patch the Secure Boot certificate update first. Windows 11 devices that miss the certificate replacement before its June 26, 2026 expiration can fail to boot or lose Secure Boot protection, and April's update leaves two months of buffer. After March's pulled patch, pilot on a test ring before broad deployment.
Device Bound Session Credentials, now generally available in Chrome 146 on Windows, cryptographically ties a site's authentication cookies to the specific device that signed in. A cookie stolen by infostealer malware is useless on the attacker's machine, which closes the main route attackers use around multi-factor authentication.
CPUID's official website was compromised on April 9-10, 2026, and for roughly six hours it intermittently served trojanized CPU-Z and HWMonitor installers that dropped STX RAT, a remote access trojan running almost entirely in memory. If anyone downloaded either tool from cpuid.com in that window, treat the machine as compromised.
Patch Adobe Acrobat Reader now. Adobe shipped emergency updates for CVE-2026-34621, a critical prototype pollution flaw in Reader's JavaScript engine that is already being exploited in the wild. Opening a malicious PDF is enough to run attacker code on the workstation, so no user mistake beyond opening a file is required.
An incident response plan documents who to call, what to shut down, who communicates with clients, whether to pay a ransom, and when to notify regulators — decided before the crisis, not during it. This template covers each section, starting with response team roles and a named backup for every role.
Start by picking a platform — Microsoft Attack Simulation Training is built into Microsoft 365 E5 and Defender for Office 365, and standalone tools exist too. Then send realistic test emails to your team, measure who clicks, who reports, and who ignores them, and use the results to decide who needs more training.
Email security works in layers. Start with DNS authentication: SPF lists the servers allowed to send as your domain, DKIM signs each message, and DMARC tells receiving servers what to do when a message fails those checks. Then add anti-phishing filtering and monitoring for inbox rules an attacker created.
A thorough security audit walks every layer in order: network perimeter and firewall firmware, identity and access controls, endpoint protection, email security, backup integrity, and compliance posture. This checklist lists the items under each category, so you can self-assess or hand it to your IT provider and confirm nothing was missed.
Admin accounts are the biggest risk because nearly every breach ends with one: domain admin, a Microsoft 365 global administrator, root on a server, or database credentials. Privileged Access Management is the practice of inventorying those accounts, limiting who holds them, and monitoring their use, shrinking the blast radius when one is stolen.
A penetration test is an authorized, controlled attempt to break into your own systems using the techniques real attackers use, then fix what it finds. Expect one because insurance carriers now ask whether you tested in the past year, and SOC 2, HIPAA, PCI-DSS, and CMMC all reference security testing.
Business email compromise is social engineering, not malware: an attacker takes over or imitates a legitimate business email account, then asks someone in accounting to wire funds or change payment details. The countermeasures are procedural — verify banking changes by phone on a known number, enforce multi-factor authentication, and watch for mailbox rules nobody set.