high7.8Known exploited
CVE-2026-41091
Microsoft Defender Link Following Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-05-20. Federal 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.
Impact
Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Malware Protection Engine | from 1.1.26030.3008 before 1.1.26040.8 |