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CVE-2026-41091

HighPublished

Microsoft Defender Elevation of Privilege Vulnerability

Published: May 20, 2026
Updated: Aug 10, 2026
Assigning CNA: microsoft
Evidence observed: May 20, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 37.1%
Model date: Oct 17, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

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

Sources

CVE-2026-41091PoC
CVE-2026-41091
CVE-2026-41091-PoC-ExploitPoC
CVE-2026-41091 RedSun | Microsoft Defender LPE exploit. Low-privileged users gain NT AUTHORITY\SYSTEM 🔥 via Cloud Files API + NTFS junction trickery. Forces Defender to write malicious payloads to System32 with SYSTEM rights. ⚠️ Actively exploited in wild. CVSS 7.8. Patch: Defender Engine 1.1.26040.8. 🛡️ Educational PoC only.
RedSun-Exploit
Windwos Zero Day Local PrivESc Exploit (CVE-2026-41091)

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