CVE-2026-41091—Microsoft Defender Link Following Vulnerability

Vulnerability Name

Microsoft Defender Link Following Vulnerability

Description

Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

Action

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

Additional Notes

• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-41091
• https://nvd.nist.gov/vuln/detail/CVE-2026-41091

Related News Articles

• Microsoft Confirms RoguePlanet Defender Zero-Day, Says Patch is in DevelopmentJune 17, 2026
• Microsoft Defender RoguePlanet Zero-Day Grants SYSTEM Access on Updated WindowsJune 10, 2026
• Critical Windows Netlogon RCE flaw now exploited in attacksJune 1, 2026
• Microsoft Slams Public Zero-Day Disclosures Amid GitHub Researcher Account RemovalMay 28, 2026
• Microsoft warns of new Defender zero-days exploited in attacksMay 21, 2026

Related Weaknesses

• CWE-59