Risk Letters

Exploited vulnerability

CVE-2026-41091

TLP:CLEAR

Microsoft Defender Link Following Vulnerability

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

Facts

  • Vendor: Microsoft
  • Product: Defender
  • CVSS: 7.8
  • EPSS (probability of exploitation within 30 days): 8.2 %
  • On CISA's Known Exploited Vulnerabilities list since: 20 May 2026
  • First known exploitation: 20 May 2026
  • CISA's deadline for US federal agencies: 3 June 2026
  • Weakness: CWE-59
  • First seen by Risk Letters: 20 May 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD