All news with #microsoft tag

🔒 Symantec warns that DragonForce ransomware used a custom Go-based backdoor, Backdoor.Turn, to hide command-and-control traffic by abusing Microsoft Teams' TURN relay infrastructure. The malware obtains anonymous Teams visitor tokens and tunnels C2 communications through legitimate TURN relays, making malicious traffic appear as normal Teams activity. The campaign, observed in December 2025, also used BYOVD drivers for kernel privileges and extensive post-exploitation tools to exfiltrate data and deploy ransomware.

📊 Over the past year Microsoft published quarterly, real‑world benchmarking that compares Microsoft Defender against secure email gateway (SEG) and integrated cloud email security (ICES) vendors. The reports show Defender consistently misses fewer high‑severity threats pre‑delivery, while ICES vendors mainly improve promotional and bulk filtering. Defender’s post‑delivery remediation contribution has risen substantially, underscoring its role as a critical backstop.

🔎 Researchers at Varonis chained three bugs into a one-click exfiltration path dubbed SearchLeak that could have pulled emails, calendar entries, and indexed files from Microsoft 365 Copilot Enterprise Search. Because the malicious link used a legitimate microsoft.com domain, URL filters and anti-phishing tools were unlikely to block it. Microsoft assigned CVE-2026-42824, mitigated the issue on its backend, and Varonis released a proof-of-concept without observed exploitation.

🔒 Microsoft fixed a critical vulnerability chain named SearchLeak in Microsoft 365 Copilot Enterprise that could let attackers exfiltrate mailbox, OneDrive, and SharePoint data via a single crafted URL. Researchers at Varonis chained a parameter-to-prompt injection, an HTML rendering race condition, and a Bing SSRF-based CSP bypass to make Copilot fetch and leak sensitive content. The issue was addressed as CVE-2026-42824 and requires no user action now that Microsoft patched it.

🔧 Microsoft fixed a known issue causing Windows updates released since May 2025 to fail when installed via the Windows Update Standalone Installer (WUSA) from a network share. The bug affected enterprise Windows 11 24H2/25H2 and Windows Server 2025 devices when multiple .msu files were present on a network share, producing ERROR_BAD_PATHNAME. Microsoft mitigated the issue for home and non-managed business devices in September 2025 and delivered a full fix in the June 2026 cumulative updates (KB5079391, KB5094125).

🔍 This post summarizes three business-focused takeaways from Microsoft Build 2026 for leaders evaluating AI adoption. It explains how Microsoft is shifting from standalone models to a shared enterprise intelligence layer—Microsoft IQ—that connects business data and processes across systems. The article highlights Azure’s agent platform and Foundry updates for production-grade deployment, governance, and performance, emphasizing that AI is expected to deliver measurable outcomes now.

🔒 Microsoft has fixed a known issue that caused some Windows Server 2025 devices to boot into BitLocker recovery after the April 2026 security update. The problem affected specific enterprise configurations where BitLocker, certain TPM/PCR7 validation settings, and a 2023-signed Windows Boot Manager interaction could trigger a one-time recovery prompt. Microsoft released KB5094125 (Server 2025) and KB5093998 (Windows 11 23H2) to address the bug and offered mitigation guidance for admins unable to deploy immediately.

🔒 June Patch Tuesday brought an unprecedented wave of fixes: Microsoft released over 200 CVEs including three disclosed zero-days and 32 critical patches, while SAP and Adobe patched multiple high-severity enterprise flaws. Microsoft warns this increase may become the new normal as AI accelerates vulnerability discovery, urging risk-based prioritization and automated patching. Administrators should urgently assess critical kernel, Active Directory, Hyper-V, and Exchange fixes.

🛡️ Microsoft released updates to fix an actively exploited Exchange Server XSS vulnerability (CVE-2026-42897) that allows remote attackers to execute arbitrary JavaScript in Outlook Web Access without privileges. The flaw affects Exchange Server 2016, 2019, and Subscription Edition; Microsoft initially deployed a temporary mitigation via the Exchange Emergency Mitigation Service and now urges admins to install the June 2026 security updates and retain mitigations for added protection.

⚠️ Microsoft alerted users that a small subset of Windows devices upgraded to Windows 11 24H2 or 25H2 may fail to install the June 2026 cumulative updates, producing errors 0x80073712 or 0x800f0993. Affected systems show these errors in Update history and logs; Microsoft says a restart will roll out a fix to unmanaged and Home devices starting May 19, 2026. For other impacted machines, Microsoft published replacement KBs and recommends removing an impacted package or performing an in-place upgrade if needed.

🔒 Microsoft released June 2026 updates fixing three zero-day vulnerabilities disclosed by a researcher known as "Nightmare Eclipse." The flaws—GreenPlasma and MiniPlasma (local privilege escalation) and YellowKey (WinRE backdoor)—allow attackers to escalate to SYSTEM or bypass BitLocker on affected Windows systems. Microsoft provided mitigations for YellowKey and criticized the public disclosure of proof-of-concepts.

🛡️ Microsoft released fixes for a record 206 security vulnerabilities in June 2026, including three publicly disclosed flaws. The update covers 39 Critical and 167 Important issues, spanning privilege escalation, RCE, information disclosure, spoofing, and more, and includes two non-Microsoft CVEs and numerous Chromium fixes affecting Edge. Notable patched bugs include a Windows Kernel use-after-free (CVE-2026-45657), HTTP.sys and DHCP client RCEs, and several BitLocker bypasses addressed after public PoCs.

🛡️ Microsoft released June Patch Tuesday updates addressing 200 vulnerabilities, including three publicly disclosed zero-days. The release fixed 33 critical CVEs — mostly remote code execution bugs — and a large share of elevation-of-privilege issues. Notable fixes include the HTTP/2 Bomb DoS (CVE-2026-49160), a BitLocker bypass (CVE-2026-50507), and a CTFMON elevation-of-privilege flaw (CVE-2026-45586). Administrators are advised to prioritize patches for several high-risk RCE and EoP bugs affecting Windows components like Win32K, Remote Desktop, DHCP client, and Hyper-V.

🛡️ An anonymous researcher known as Chaotic Eclipse published a proof-of-concept for a Microsoft Defender zero-day dubbed RoguePlanet, a race-condition exploit that can yield SYSTEM-level shells on Windows 10 and 11 with June 2026 patches. The PoC is inconsistent across systems and currently fails on Windows Server due to ISO mounting restrictions. The disclosure follows prior Defender flaws from the same researcher and a public conflict with Microsoft over coordinated disclosure and account revocation.

🚨 Microsoft released fixes addressing nearly 200 vulnerabilities in its June 2026 Patch Tuesday, the largest monthly tally to date, with almost three dozen rated critical and public exploit code for at least three flaws. Multiple zero-days were patched, including CVE-2026-49160 affecting IIS and CVE-2026-50507 for BitLocker, with some reports tied to researcher "Nightmare Eclipse." Microsoft and other vendors noted rising use of AI in vulnerability discovery and unusually high browser flaw counts this month.

🛡️ Microsoft released its June 2026 security update addressing 206 vulnerabilities, including 32 marked critical. Talos highlights multiple RCEs across Windows components, Office, Azure services, and other products, and calls out several vulnerabilities as more likely to be exploited. Cisco Talos published Snort 2 and Snort 3 rules to detect exploitation attempts and urges customers to update rule packs promptly.

🔒 Microsoft released the Windows 10 KB5094127 Extended Security Update, which applies June 2026 Patch Tuesday fixes and adds functionality to monitor the rollout of renewed Secure Boot certificates. The update brings Windows 10 to build 19045.7417 and Windows 10 Enterprise LTSC 2021 to build 19044.7417, and is available to Enterprise LTSC and ESU-enrolled systems via Windows Update. It also improves File Explorer search, enables dynamic Secure Boot status reporting, introduces the LimitSecureBootRequiredServiceData policy, and expands targeted delivery of new Secure Boot certificates. Microsoft warns of a known BitLocker recovery prompt issue for certain TPM/PCR7 and Secure Boot configurations and suggests a temporary Group Policy workaround while a permanent fix is prepared.

🛡️ Microsoft released its June 2026 Patch Tuesday addressing 200 vulnerabilities, including three publicly disclosed zero-day flaws. The update includes 33 Critical issues — 28 of them remote code execution — and a broad mix of elevation of privilege, information disclosure, spoofing, and DoS bugs. Microsoft also provided mitigations and new settings, such as MaxHeadersCount for HTTP/2, and highlighted that some fixes were issued earlier for cloud and Edge components.

🛡️ Microsoft released its June 2026 Patch Tuesday addressing 200 vulnerabilities, including five publicly disclosed zero-days and one actively exploited flaw. The updates cover 33 Critical issues, with numerous RCE, elevation of privilege, information disclosure, and other vulnerabilities across Windows, Exchange, BitLocker, HTTP/2 and more. Microsoft also provided mitigations and new settings such as a MaxHeadersCount registry key for HTTP/2.

🔍 Microsoft outlines a structured approach to investigate AI interactions across Microsoft 365 Copilot and Azure AI services, emphasizing telemetry from Purview, Defender, and Sentinel. The new investigator playbook follows a scope–context–signal methodology to identify who interacted with AI systems, what resources were accessed, and when events occurred. It operationalizes detection logic, KQL queries, and schema references to help response teams build coherent investigative narratives and assess impact.