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Cybersecurity

Microsoft Teams’ Efficiency Mode Arrives for Low‑End Devices

Microsoft is rolling out an Efficiency Mode for Microsoft Teams designed to help devices with limited CPU and memory run the app more smoothly. Announced in a Microsoft message center update, the feature will be enabled by default on eligible hardware and aims to improve responsiveness and meeting quality by dynamically adjusting how Teams uses system resources. What Efficiency Mode Does Efficiency Mode reduces resource consumption by changing a few…

Saugata DattaApr 22, 20264 min read327

Microsoft

How Attackers Abuse Microsoft Teams and Quick Assist: Inside the Helpdesk Impersonation Playbook

A new wave of attacks is quietly abusing everyday collaboration tools to bypass user suspicion and gain hands-on control of corporate endpoints. Threat actors are impersonating internal IT helpdesk staff inside Microsoft Teams, convincing employees to grant remote access via Quick Assist, and then using that live access to deploy stealthy persistence mechanisms and move laterally through enterprise networks. Because the attack uses trusted, signed applications and normal business channels,…

Saugata DattaApr 20, 20265 min read414

Cybersecurity

New RDP Alert After April 2026 Security Update Warns of Unknown Connections

Microsoft’s April 2026 Patch Tuesday introduced a small-looking but important change to how Windows handles Remote Desktop (.rdp) files. What used to be a silent, one-click experience can now surface clear warnings about unknown connections and requested local resource access, closing an easy door attackers have been exploiting for phishing and session hijacking. For organizations and individual users alike, the update shifts the default toward safer, more explicit consent when…

Saugata DattaApr 20, 20264 min read347

Cybersecurity

RedSun: New Microsoft Defender Zero-Day Lets Unprivileged Users Gain SYSTEM Access

A freshly disclosed zero-day vulnerability in Microsoft Defender, dubbed "RedSun," has raised alarms across enterprise security teams: an unprivileged user can escalate to full SYSTEM-level access on fully patched Windows systems. The flaw was detailed publicly in April 2026 by a researcher known as "Chaotic Eclipse" (also referenced as Nightmare‑Eclipse on GitHub). Independent verification from vulnerability analyst Will Dormann confirms the exploit works reliably on current Windows releases, and as…

Saugata DattaApr 17, 20264 min read351

Azure

One-Click RCE in Azure Windows Admin Center: what happened and what you need to do

Windows Admin Center (WAC) is a convenient, browser-based management hub for administrators to manage servers, clients, and clusters from a centralized interface. A recent Cymulate Research Labs disclosure describes a critical chain of flaws that let an attacker achieve unauthenticated, one-click remote code execution (RCE) against both Azure-integrated and on-premises WAC deployments. The exploit requires little user interaction—a maliciously crafted link—and, if successful, can silently execute arbitrary commands and take…

Saugata DattaApr 17, 20265 min read352

Microsoft

Microsoft Confirms Reboot Loops on Windows Server 2025 After April Patch KB5082063

Microsoft has confirmed a critical stability problem affecting some Windows Server 2025 domain controllers following the April 2026 cumulative update (KB5082063). Administrators around the world reported domain controllers entering repeated reboot cycles after installing the update released on April 14, 2026, and Microsoft’s release notes were updated to acknowledge the issue and a related installation failure affecting a subset of systems. What happened Microsoft shipped KB5082063 (OS Build 26100.32690) as…

Saugata DattaApr 17, 20263 min read374

Microsoft

Windows Secure Boot: A practical playbook for certificates expiring in 2026

Microsoft’s Secure Boot certificates issued in 2011 are approaching their expiration window in 2026. While affected devices will continue to boot and receive regular Windows updates, they will stop receiving new protections for the pre-boot environment — updates to Windows Boot Manager, Secure Boot DB/DBX revocations, and mitigations for newly discovered boot-level vulnerabilities. Many newer PCs already include the 2023 certificates, but organizations should act now to inventory, monitor, pilot,…

Saugata DattaApr 17, 20265 min read347

Artificial Intelligence

OpenAI’s GPT-5.4-Cyber: a practical boost for defenders — and a new risk calculus

OpenAI has introduced GPT-5.4-Cyber, a purpose-built variant of GPT-5.4 tuned to assist vetted security professionals with tasks previously reserved for specialized analysts. Rather than a general consumer release, this model is designed to lower refusal rates for legitimate cybersecurity workflows: binary reverse engineering, vulnerability scanning, malware analysis and exploit research. The announcement frames the model as a defensive accelerant — a tool to help defenders inspect compiled software and evaluate…

Saugata DattaApr 15, 20264 min read364

Server and Virtualisation

Compromised Trust: CPUID Supply‑Chain Attack Served Trojanized CPU‑Z and HWMonitor Installers

Hackers briefly hijacked a CPUID distribution channel and altered download links on the vendor’s official website so that users seeking the popular CPU‑Z and HWMonitor utilities would instead receive a trojanized installer. The modification redirected downloads to Cloudflare R2 storage and delivered a malicious file masquerading as HWiNFO, exposing millions of users who rely on these tools for hardware diagnostics and monitoring to a potentially stealthy infostealer and multi‑stage loader.…

Saugata DattaApr 11, 20264 min read530

Cybersecurity

Critical RCE in Ninja Forms File Upload Exposes ~50,000 WordPress Sites

A recently disclosed vulnerability in the popular Ninja Forms “File Upload” addon has placed roughly 50,000 WordPress sites at risk of full takeover. Tracked as CVE-2026-0740 and carrying a CVSS score of 9.8, the flaw allows unauthenticated arbitrary file uploads — a straightforward path to remote code execution (RCE) for attackers. Site owners who rely on the affected plugin must act immediately to patch and inspect their environments. What happened…

Saugata DattaApr 7, 20264 min read534

Cybersecurity

Researcher Publishes Windows Defender 0-Day ‘BlueHammer’ LPE Proof‑of‑Concept

A security researcher using the handle Chaotic Eclipse has publicly released a working proof‑of‑concept for a Windows zero‑day local privilege escalation (LPE) exploit called "BlueHammer." The disclosure, accompanied by full source code on GitHub, was confirmed as functional by vulnerability researcher Will Dormann and demonstrates that a low‑privileged local user can escalate to NT AUTHORITYSYSTEM on affected machines. The release has sparked concern across the security community because it is…

Saugata DattaApr 7, 20264 min read376

Compliance and Privacy

Announcing General Availability of Server Logic in Power Pages

Power Pages has taken a significant step forward: Server Logic is now generally available for production use. What began as a preview capability to bring server-side processing closer to makers and developers has matured into a production-ready feature designed for enterprise scenarios. With this GA release, organizations gain a native, governed, and extensible way to run server-side operations directly within Power Pages—reducing complexity, improving performance, and enabling more secure integration…

Saugata DattaApr 7, 20263 min read572

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