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Tag: Microsoft

Microsoft Patches Critical ASP.NET Core CVE-2026-40372 Privilege Escalation Bug

Microsoft has released out-of-band updates to address a security vulnerability in ASP.NET Core that could allow an attacker to escalate privileges. The vulnerability, tracked as CVE-2026-40372, carries a CVSS score of 9.1 out of 10.0. It’s rated Important in severity. An anonymous researcher has been credited with discovering and reporting the flaw. “Improper verification of…

Attackers abuse Microsoft Teams to impersonate the IT helpdesk in a new enterprise intrusion playbook

Attackers are increasingly exploiting enterprise collaboration platforms such as Microsoft Teams to gain initial access, impersonating IT helpdesk staff and persuading employees to grant remote control, according to new research from Microsoft. In a blog post, Microsoft described a “cross-tenant helpdesk impersonation” technique in which threat actors initiate conversations with employees via Teams’ external access…

Microsoft Defender under attack as three zero-days, two of them still unpatched, enable elevated access

Attackers exploit three Microsoft Defender zero-days, code-named BlueHammer, RedSun, and UnDefend, to gain elevated access. Attackers are exploiting three recently disclosed zero-day flaws in Microsoft Defender to gain higher privileges on compromised systems. The vulnerabilities, called BlueHammer, RedSun, and UnDefend, were revealed by a researcher known as Chaotic Eclipse after criticizing Microsoft’s handling of the…

Another Microsoft Defender privilege escalation bug emerges days after patch

Days after Microsoft patched a high-severity issue affecting its Windows Defender antivirus tool through April’s Patch Tuesday, researchers warn of another vulnerability that could enable SYSTEM privileges through local escalation. In a newly disclosed proof-of-concept (PoC) exploit, dubbed “RedSun,” GitHub user going by the name “Nightmare Eclipse” demonstrated how Microsoft Defender’s handling of certain cloud-tagged…

Windows is getting stronger RDP file protections to fight phishing attacks

Microsoft has introduced new Windows protections starting with the April 2026 security update to reduce phishing attacks that abuse Remote Desktop (.rdp) files. With these updates, the Remote Desktop Connection app displays stronger warning dialogs before a connection is established, shows details about the remote system, and requires users to review any request to share…

Microsoft to cut Windows 365 price for SMBs

Microsoft will cut the price of Windows 365 subscriptions for small and mid-sized businesses by 20% next month, though analysts expect little impact on uptake of the Desktop-as-a-Service (DaaS) platform.  The price change for Windows 365 Business takes effect May 1, 2026 for new subscriptions; existing subscribers will receive updated pricing at renewal, Microsoft explained…

U.S. CISA adds Microsoft SharePoint Server, and Microsoft Office Excel flaws to its Known Exploited Vulnerabilities catalog

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Microsoft SharePoint Server, and Microsoft Office Excel flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Apple, Laravel Livewire and Craft CMS flaws to its Known Exploited Vulnerabilities (KEV) catalog. Below are the flaws added to the catalog: CVE-2009-0238 Microsoft Office Remote…

April Patch Tuesday Fixes Critical Flaws Across SAP, Adobe, Microsoft, Fortinet, and More

A number of critical vulnerabilities impacting products from Adobe, Fortinet, Microsoft, and SAP have taken center stage in April’s Patch Tuesday releases. Topping the list is an SQL injection vulnerability impacting SAP Business Planning and Consolidation and SAP Business Warehouse (CVE-2026-27681, CVSS score: 9.9) that could result in the execution of arbitrary database 

Microsoft Patch Tuesday for April 2026 fixed actively exploited SharePoint zero-day

Microsoft Patch Tuesday security updates for April 2026 fixed 165 vulnerabilities, including an actively exploited SharePoint zero-day. Microsoft Patch Tuesday security updates addressed 165 vulnerabilities, making it one of the largest updates by CVE count. One of the most interesting flaws fixed by the IT giant is a critical SharePoint zero-day, tracked as CVE-2026-32201, already…

Patch Tuesday, April 2026 Edition

Microsoft today pushed software updates to fix a staggering 167 security vulnerabilities in its Windows operating systems and related software, including a SharePoint Server zero-day and a publicly disclosed weakness in Windows Defender dubbed “BlueHammer.” Separately, Google Chrome fixed its fourth zero-day of 2026, and an emergency update for Adobe Reader nixes an actively exploited…

Microsoft drops its second-largest monthly batch of defects on record

Microsoft addressed 165 vulnerabilities affecting its various products and underlying systems, including one actively exploited vulnerability in Microsoft Office SharePoint, in this month’s Patch Tuesday update.  “By my count, this is the second-largest monthly release in Microsoft’s history,” Dustin Childs, head of threat awareness at Trend Micro’s Zero Day Initiative, wrote in a blog post…

U.S. CISA adds Adobe, Fortinet, Microsoft Exchange Server, and Microsoft Windows flaws to its Known Exploited Vulnerabilities catalog

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Adobe, Fortinet, Microsoft Exchange Server, and Microsoft Windows flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Apple, Laravel Livewire and Craft CMS flaws to its Known Exploited Vulnerabilities (KEV) catalog. Below are the flaws added to the catalog: CVE-2026-34621 Adobe Acrobat…

Questions raised about how LinkedIn uses the petabytes of data it collects

Through LinkedIn’s more than one billion business users, the Microsoft unit has access to a vast array of personally-identifiable information, including data that could identify religious and political positions. What is less clear is what LinkedIn does with all of that data. A small European company that sells a browser extension to leverage different aspects…

Questions raised about how LinkedIn uses the petabytes of data it collects

Through LinkedIn’s more than one billion business users, the Microsoft unit has access to a vast array of personally-identifiable information, including data that could identify religious and political positions. What is less clear is what LinkedIn does with all of that data. A small European company that sells a browser extension to leverage different aspects…

Microsoft’s new Agent Governance Toolkit targets top OWASP risks for AI agents

Microsoft has quietly introduced the Agent Governance Toolkit, an open-source project designed to monitor and control AI agents during execution as enterprises try to move them into production workflows. The toolkit, which is a response to the Open Worldwide Application Security Project’s (OWASP) emerging focus on AI and LLM security risks, adds a runtime security…

Microsoft’s new Agent Governance Toolkit targets top OWASP risks for AI agents

Microsoft has quietly introduced the Agent Governance Toolkit, an open-source project designed to monitor and control AI agents during execution as enterprises try to move them into production workflows. The toolkit, which is a response to the Open Worldwide Application Security Project’s (OWASP) emerging focus on AI and LLM security risks, adds a runtime security…

Microsoft says Medusa-linked Storm-1175 is speeding ransomware attacks

Microsoft has warned that Storm-1175, a cybercrime group linked to Medusa ransomware, is exploiting vulnerable web-facing systems in fast-moving attacks, at times moving from initial access to data theft and ransomware deployment within 24 hours. The company said the group has heavily targeted organizations in healthcare, education, professional services, and finance across Australia, the UK,…

Iran-Linked Password-Spraying Campaign Targets 300+ Israeli Microsoft 365 Organizations

An Iran-nexus threat actor is suspected to be behind a password-spraying campaign targeting Microsoft 365 environments in Israel and the U.A.E. amid ongoing conflict in the Middle East. The activity, assessed to be ongoing, was carried out in three distinct attack waves that took place on March 3, March 13, and March 23, 2026, per Check Point. “The campaign is…

Microsoft 365 explained: Office 365, rebranded and expanded

Microsoft 365 arrived to much fanfare at its launch in July 2017, with Microsoft CEO Satya Nadella promising a “fundamental departure” in how the company thinks about product creation. Nearly nine years later, Microsoft 365 has become Microsoft’s core brand for workplace productivity software, having largely replaced the Office 365 branding long associated with the…

Microsoft builds its own AI stack to help wean it from its reliance on OpenAI

Microsoft seems to be meeting OpenAI on its own turf, even as it continues its strategic partnership with the AI darling, with the release of three in-house, commercially-available AI models. MAI-Transcribe-1 (for speech transcription), MAI-Voice-1 (for voice generation), and MAI-Image-2 (for image creation) are now available on Microsoft Foundry and the MAI Playground. These new…

Microsoft Warns of WhatsApp-Delivered VBS Malware Hijacking Windows via UAC Bypass

Microsoft is calling attention to a new campaign that has leveraged WhatsApp messages to distribute malicious Visual Basic Script (VBS) files. The activity, beginning in late February 2026, leverages these scripts to initiate a multi-stage infection chain for establishing persistence and enabling remote access. It’s currently not known what lures the threat actors use to…

WhatsApp malware campaign uses malicious VBS files to gain persistent access

Microsoft is warning WhatsApp users of a new malware campaign that tricks them into executing malicious Visual Basic Script (VBS) files, ultimately enabling persistence and remote access. In a March 31 report, Microsoft Defender Experts said attackers have been distributing malicious Visual Basic Script (VBS) files through WhatsApp since at least late February, relying on…

Microsoft facing CMA probe of its business software portfolio

The regulatory body which last year accused Microsoft of inflating its office software’s license prices when it was run on rival cloud platforms to make those platforms less appealing, said Tuesday it will conduct a further investigation into the company’s entire business software ecosystem. The probe by the UK’s Competition and Markets Authority (CMA), scheduled…

The Invisible Breach: How AI Agents Became the Most Dangerous Attack Surface of 2025–2026

The Attack That Requires No Click In June 2025, Microsoft patched a critical vulnerability in Microsoft 365 Copilot — one that its discoverers at Aim Security described as something that had never been seen before. A threat actor needed only to send a carefully crafted email to any employee within a target organization. No link.…

Microsoft adds multi-model AI to Copilot Researcher, raising accuracy stakes

Microsoft is expanding its Microsoft 365 Copilot “Researcher” agent with new multi-model capabilities designed to improve the accuracy and depth of AI-generated research outputs. The update introduces a “Critique” system that assigns separate roles for generation and evaluation, alongside a “Council” feature that compares outputs from multiple models and highlights agreement, divergence, and unique insights.…

A critical Windows security fix puts legacy hardware on borrowed time

Microsoft is finally blocking a long-since retired program that it said led to “abuse and credential theft,” yet remained widely trusted for years. Beginning in April, Redmond will remove trust for kernel drivers that haven’t been vetted through its Windows Hardware Compatibility Program (WHCP). The company is specifically targeting kernel drivers signed by the now…

Active Directory Risks Reshaping M365 Migrations for MSPs

As Microsoft 365 migrations accelerate, many IT teams and MSPs are discovering that identity, not productivity workloads, is the biggest source of risk.  While email and collaboration tools are often straightforward to move, Active Directory environments introduce hidden complexity that can disrupt users, security, and access if handled incorrectly. In this Q&A, BitTitan’s Aaron Wadsworth…

Microsoft maps Windows 11 quality overhaul after acknowledging gaps

Microsoft is planning a broad push to improve Windows 11. The development comes just months after the company publicly admitted that the operating system fell short on performance, following user criticism. Users have been experiencing inconsistencies, recurring bugs, and performance issues. The company has now outlined a clear roadmap to enhance performance and reliability. The…

An AI-powered phishing campaign has compromised hundreds of organizations

A phishing campaign tied to AI cloud-hosting service Railway has given hackers access to the Microsoft cloud accounts for hundreds of businesses, according to researchers at Huntress. Rich Mozeleski, product manager for Huntress’ identity team, told CyberScoop the campaign is currently tied to a smaller actor and approximately a dozen IP addresses, but has managed…

CISA warns of active exploitation of Microsoft SharePoint vulnerability (CVE-2026-20963)

CVE-2026-20963, a remote code execution (RCE) SharePoint vulnerability Microsoft fixed in January 2026, is being exploited by attackers. The confirmation comes from the US Cybersecurity and Infrastructure Security Agency (CISA), which added the flaw to its Known Exploited Vulnerabilities (KEV) catalog on Wednesday. About CVE-2026-20963 CVE-2026-20963 affects Microsoft SharePoint Server Subscription Edition, Microsoft SharePoint Server…

Druva connects identity data and behavior to restore access after attacks

Druva has revealed Druva Identity Resilience, adding support for Okta and Microsoft Active Directory alongside Microsoft Entra ID. Druva Identity Resilience delivers unified protection, cyber recovery, and threat detection and response in a single SaaS platform, bringing disparate identity providers together so security and IT teams can restore trusted access through one coordinated process. Identity-driven…