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Description

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

PUBLISHED Reserved 2026-04-16 | Published 2026-05-20 | Updated 2026-05-20 | Assigner microsoft




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CISA Known Exploited Vulnerability

Date added 2026-05-20 | Due date 2026-06-03

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Problem types

CWE-59: Improper Link Resolution Before File Access ('Link Following')

Product status

-
affected

References

www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-41091 government-resource

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41091 (Microsoft Defender Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-41091)

nvd.nist.gov (CVE-2026-41091)

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