CVE-2026-41091: Microsoft Defender Link Following Vulnerability
Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to elevate privileges locally.
Other sources
Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.
— CISA
Microsoft Defender Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 1.1.26040.8
Event History
Frequently Asked Questions
What is the severity of CVE-2026-41091?
The severity of CVE-2026-41091 is rated high with a score of 7.8.
What type of vulnerability is CVE-2026-41091?
CVE-2026-41091 is a link following vulnerability in Microsoft Defender that can allow privilege escalation.
Who is affected by CVE-2026-41091?
CVE-2026-41091 affects users of Microsoft Malware Protection Engine and Microsoft Defender.
How do I fix CVE-2026-41091?
To fix CVE-2026-41091, apply mitigations as per vendor instructions or discontinue use of the product if no mitigations are available.
Is CVE-2026-41091 actively exploited?
Yes, CVE-2026-41091 is KEV-listed and has been identified as actively exploited.