Security watch

Vulnerabilities attackers are exploiting right now

Zero-days first, then everything added to the CISA Known Exploited Vulnerabilities catalog in the last 30 days, and high and critical flaws in popular software. Updated 13 Nov 2026.

What counts as a zero-day here

Flaws that the vendor says were exploited, or publicly disclosed, before a fix was available. Microsoft publishes this flag for every vulnerability, so Microsoft entries are complete. CISA marks a few others in its own wording. Other vendors do not publish a machine-readable flag, so the absence of a badge does not prove a flaw was not a zero-day. The last 150 days are shown, and entries from the last 30 days have a red edge.

CVE-2026-12419410 Nov 2026
Zero-day, exploitedCVSS 6.5 Moderate

Microsoft Outlook Spoofing Vulnerability

Microsoft · Microsoft Office Outlook

Product ui does not warn user of unsafe actions in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Vendor advisory →
CVE-2026-11149725 Oct 2026
Disclosed before a fixCVSS 8.1 Critical

Google: CVE-2026-111497 Buffer overflow vulnerability in the Brotli decoder

Microsoft · .NET

Out-of-bounds write in .NET allows an unauthorized attacker to elevate privileges over a network.

Vendor advisory →
CVE-2026-9695113 Oct 2026
Zero-day, exploitedCVSS 8.8 Important

Windows Shell Security Feature Bypass Vulnerability

Microsoft · Windows Shell

Improper neutralization of special elements used in a command ('command injection') in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

Vendor advisory →
CVE-2026-9270713 Oct 2026
Disclosed before a fixCVSS 5.3 Moderate

MessagePack-CSharp Denial of Service Vulnerability

Microsoft · .NET

Improperly controlled sequential memory allocation in .NET allows an unauthorized attacker to deny service over a network.

Vendor advisory →
CVE-2026-10839813 Oct 2026
Disclosed before a fixCVSS 8.8 Important

.NET Framework Security Feature Bypass Vulnerability

Microsoft · .NET Framework

Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.

Vendor advisory →
CVE-2026-858808 Sep 2026
Zero-day, exploitedCVSS 7.8 Important

Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

Microsoft · Windows ALPC

Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.

Vendor advisory →
CVE-2026-819638 Sep 2026
Zero-day, exploitedCVSS 7.8 Important

Windows Update Stack Elevation of Privilege Vulnerability

Microsoft · Windows Update Stack

Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.

Vendor advisory →
CVE-2026-6941414 Aug 2026
Disclosed before a fixCVSS 7.8 Important

Microsoft Defender Elevation of Privilege Vulnerability

Microsoft · Microsoft Defender

Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as "ShieldBreak ".

Vendor advisory →
CVE-2026-7297111 Aug 2026
Disclosed before a fixCVSS 5.5 Important

Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability

Microsoft · Windows Container Isolation FS Filter Driver (unionfs.sys)

Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.

Vendor advisory →
CVE-2026-6882011 Aug 2026
Zero-day, exploitedCVSS 7 Important

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Microsoft · Windows Ancillary Function Driver for WinSock

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Vendor advisory →
CVE-2026-6283211 Aug 2026
Disclosed before a fixCVSS 7.8 Important

Windows User Profile Service Elevation of Privilege Vulnerability

Microsoft · Windows User Profile Service

Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.

Vendor advisory →
CVE-2026-5864414 Jul 2026
Zero-day, exploitedRemote code executionCVSS 9.8 Critical

Microsoft SharePoint Remote Code Execution Vulnerability

Microsoft · Microsoft Office SharePoint

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

Vendor advisory →
CVE-2026-5616414 Jul 2026
Zero-day, exploitedCVSS 5.3 Moderate

Microsoft SharePoint Server Elevation of Privilege Vulnerability

Microsoft · Microsoft Office SharePoint

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

Vendor advisory →
CVE-2026-5615514 Jul 2026
Zero-day, exploitedCVSS 7.8 Important

Active Directory Federation Services Elevation of Privilege Vulnerability

Microsoft · Active Directory Federation Services (AD FS)

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

Vendor advisory →
CVE-2026-5066114 Jul 2026
Disclosed before a fixCVSS 6.1 Important

Windows BitLocker Security Feature Bypass Vulnerability

Microsoft · Windows BitLocker

Protection mechanism failure in Windows BitLocker allows an unauthorized attacker to bypass a security feature with a physical attack.

Vendor advisory →

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