Microsoft Defender Link Following Vulnerability
Known exploited
CVE-2026-41091
Summary
Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.
Why it matters
CVE-2026-41091 is listed in CISA's Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. CISA remediation deadline: 2026-06-03. Treat remediation as urgent.
Operator check
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.