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CVE-2026-41091— Microsoft Defender Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Microsoft Malware Protection Engine
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Defender是美国微软（Microsoft）公司的一款威胁防护软件。 Microsoft Defender存在后置链接漏洞，该漏洞源于文件访问前链接解析不当，可能导致授权攻击者本地提升权限。

CVSS 7.8 · High KEV EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Malware Protection Engine 1.1.0.0< 1.1.26040.8 affected
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I. Basic Information for CVE-2026-41091

Vulnerability Information
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Vulnerability Title
Microsoft Defender Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to elevate privileges locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Defender 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Defender是美国微软（Microsoft）公司的一款威胁防护软件。 Microsoft Defender存在后置链接漏洞，该漏洞源于文件访问前链接解析不当，可能导致授权攻击者本地提升权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Malware Protection Engine 1.1.0.0 ~ 1.1.26040.8 -

II. Public POCs for CVE-2026-41091

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III. Intelligence Information for CVE-2026-41091

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Vendor Advisories for CVE-2026-41091 (1)

Same Patch Batch · Microsoft · 2026-05-20 · 4 CVEs total

CVE-2026-45584 8.1 HIGH Microsoft Defender Remote Code Execution Vulnerability
CVE-2026-42834 7.8 HIGH Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability
CVE-2026-45498 4.0 MEDIUM Microsoft Defender Denial of Service Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft Malware Protection Engine
Same vendor: Microsoft
Same weakness: CWE-59

V. Comments for CVE-2026-41091

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