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Microsoft has released its security update for February 2026, addressing 61 vulnerabilities across its ecosystem. But the headline isn’t the volume of patches—it’s the urgency. The tech giant is actively battling six zero-day vulnerabilities that are currently being exploited in the wild, with a critical flaw in the Windows Desktop Window Manager (DWM) taking center stage.
The update includes fixes for five critical and 52 important-severity flaws, covering everything from Microsoft Exchange Server to core Windows components.
The most prominent threat in this month’s lineup is CVE-2026-21519, a zero-day vulnerability in the Desktop Window Manager. DWM is the ubiquitous service responsible for rendering visual effects in Windows, such as transparent windows, live taskbar thumbnails, and high-resolution support.
Because DWM runs on virtually every modern Windows machine, this flaw represents a massive attack surface.
- The Exploit: Attackers are actively exploiting this vulnerability to gain Elevation of Privilege (EoP).
- The Impact: By compromising the DWM process, an attacker can escalate their permissions to the SYSTEM level, effectively seizing total control of the machine.
Beyond the active DWM exploit, Microsoft patched several other dangerous flaws that attackers could leverage to crash systems or bypass security controls.
- Remote Access Crash (CVE-2026-21525): A Denial of Service (DoS) vulnerability was fixed in the Windows Remote Access Connection Manager, a core service for VPNs and dial-up connections. A “null pointer dereference” bug allowed unauthenticated attackers to crash the service locally, potentially disrupting corporate connectivity.
- Word Security Bypass (CVE-2026-21514): This flaw allows attackers to bypass security features in Microsoft Word. To exploit it, an attacker must use social engineering to convince a user to open a malicious Office file.
- Browser Engine Flaw (CVE-2026-21513): A security feature bypass was also found in the MSHTML Framework (Trident), the engine used to render web content in Windows applications. Successful exploitation requires convincing a user to click a malicious link or file.
- Windows Shell Security Feature Flaw (CVE-2026-21510): An attacker could bypass Windows SmartScreen and Windows Shell security prompts by exploiting improper handling in Windows Shell components, allowing attacker‑controlled content to execute without user warning or consent.
- Windows Remote Desktop Services Elevation of Privilege Vulnerability (CVE-2026-21533): An improper privilege management flaw in Windows Remote Desktop could allow an authenticated attacker to elevate privileges locally. An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
This month’s update creates a heavy workload for administrators, with Elevation of Privilege bugs dominating the list.
- Elevation of Privilege: 25 vulnerabilities (3 Critical).
- Remote Code Execution: 12 vulnerabilities.
- Spoofing: 7 vulnerabilities.
- Information Disclosure: 6 vulnerabilities.
- Security Feature Bypass: 5 vulnerabilities.
- Denial of Service: 3 vulnerabilities.
With active exploitation confirmed, IT teams are strongly advised to prioritize the DWM patch to lock down endpoints against immediate threats.
Related Posts:
- Windows DWM Flaw Lets Local Users Paint Their Way to SYSTEM Privileges, PoC Publishes
- CVE-2024-30051: Windows Elevation of Privilege Flaw Exploited by QakBot Malware, PoC Published
- CISA & Microsoft Warn of 6 Actively Exploited Zero-Day Vulnerabilities
- Microsoft May 2025 Patch Tuesday Fixes 83 Vulnerabilities, Including 5 Exploited in the Wild
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