Microsoft: Some Windows servers enter reboot loops after April patches

Microsoft has confirmed that some Windows domain controllers are entering restart loops due to Local Security Authority Subsystem Service (LSASS) crashes after installing the April 2026 security updates. The company also warned that Windows admins may encounter this issue when setting up new domain controllers, or even on existing ones, if the server processes authentication […]

Recently leaked Windows zero-days now exploited in attacks

Threat actors are exploiting three recently disclosed Windows security vulnerabilities in attacks aimed at gaining SYSTEM or elevated administrator permissions. Since the start of the month, a security researcher known as “Chaotic Eclipse” or “Nightmare-Eclipse” has published proof-of-concept exploit code for all three security issues in protest to how Microsoft’s Security Response Center (MSRC) handled […]

New Microsoft Defender “RedSun” zero-day PoC grants SYSTEM privileges

A researcher known as “Chaotic Eclipse” has published a proof-of-concept exploit for a second Microsoft Defender zero-day, dubbed “RedSun,” in the past two weeks, protesting how the company works with cybersecurity researchers. This exploit is for a local privilege escalation (LPE) flaw that grants SYSTEM privileges in Windows 10, Windows 11, and Windows Server on […]

Microsoft pays $2.3M for cloud and AI flaws at Zero Day Quest

Microsoft has awarded $2.3 million to security researchers after receiving nearly 700 submissions during this year’s Zero Day Quest hacking contest. Tom Gallagher, Vice President of Engineering at Microsoft Security Response Center (MSRC), said that over 80 flaws found during the live event at Microsoft’s Redmond campus were high-impact cloud and AI security vulnerabilities. “During the […]

Microsoft adds Windows protections for malicious Remote Desktop files

Microsoft has introduced new Windows protections to defend against phishing attacks that abuse Remote Desktop connection (.rdp) files, adding warnings and disabling risky shared resources by default. RDP files are commonly used in enterprise environments to connect to remote systems because admins can preconfigure them to automatically redirect local resources to the remote host. Threat […]

Microsoft releases Windows 10 KB5082200 extended security update

Microsoft has released the Windows 10 KB5082200 extended security update to fix the April 2026 Patch Tuesday vulnerabilities, including 2 zero-days. This update brings some interesting changes, including new Remote Desktop Protocol file phishing protections and new Windows Security indicators that provide the status of the rollout of new Secure Boot certificates. If you are running […]

Microsoft: Canadian employees targeted in payroll pirate attacks

A financially motivated threat actor tracked as Storm-2755 is stealing Canadian employees’ salary payments after hijacking their accounts in payroll pirate attacks. The attackers used malicious Microsoft 365 sign-in pages to steal victims’ authentication tokens and session cookies by redirecting them to domains (e.g., bluegraintours[.]com) hosting malicious web pages (pushed to the top of search […]

Disgruntled researcher leaks “BlueHammer” Windows zero-day exploit

Exploit code has been released for an unpatched Windows privilege escalation flaw reported privately to Microsoft, allowing attackers to gain SYSTEM or elevated administrator permissions. Dubbed BlueHammer, the vulnerability was published by a security researcher discontent with how Microsoft’s Security Response Center (MSRC) handled the disclosure process. Since, the security issue has no official patch and there […]