Vulnerabilities
Microsoft Patches Two Actively Exploited Defender Zero-Days — UnDefend and RedSun Were Built to Disable the Security Tool Itself
Microsoft patched UnDefend (CVE-2026-41091) and RedSun (CVE-2026-45498), two Defender zero-days exploited in the wild since April. Their purpose is the security tool itself — one escalates through Defender, the other disables it. Barracuda ties the wave to the researcher behind MiniPlasma.