Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since May 20, 2026.
CVE-2026-41091
Microsoft Defender Link Following Vulnerability
Added to KEV May 20, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-41091
- CWE
- CWE-59
- Affected products
- Defender · Microsoft Defender · Microsoft
What happened
Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.
What it means for your business
Microsoft Defender is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-41091). Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally. CISA remediation due date: 2026-06-03. If you need help checking exposure, call (864) 335-9223.
Required 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.
CISA due date: June 3, 2026
Sources
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