Why Security Researchers Deserve Respect: Lessons from the 2026 Windows Defender Zero‑Day Fallout

In April 2026 a trio of Windows Defender zero‑day bugs—BlueHammer, RedSun and UnDefend—were publicly disclosed after Microsoft’s Security Response Center repeatedly ignored the researcher’s reports, sparking a debate over responsible disclosure, corporate trust, and the urgent need to respect security professionals.

BlueHammerMicrosoftWindows Defender

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Why Security Researchers Deserve Respect: Lessons from the 2026 Windows Defender Zero‑Day Fallout

Black & White Path

Apr 17, 2026 · Information Security

RedSun PoC Uses Windows Defender Tag to Overwrite Files and Escalate Privileges

The RedSun proof‑of‑concept demonstrates that when Windows Defender detects a malicious file marked with a cloud‑based detection tag, it may rewrite the file to its original location instead of isolating it, allowing an attacker to replace system files and obtain administrator privileges.

Local Privilege EscalationRedSunWindows Defender

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RedSun PoC Uses Windows Defender Tag to Overwrite Files and Escalate Privileges

IT Services Circle

Apr 23, 2025 · Information Security

How to Add Windows Defender Exclusions Manually and via PowerShell

This guide explains two ways to whitelist files or folders in Windows Defender: a step‑by‑step manual method through the Windows Security UI and a PowerShell command‑line approach for adding or removing exclusion paths.

ExclusionsPowerShellWhitelist

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How to Add Windows Defender Exclusions Manually and via PowerShell

IT Services Circle

Mar 13, 2022 · Information Security

Enabling Microsoft MAPS Advanced Protection in Windows Defender

This article explains why Windows Defender is generally sufficient, how security professionals can unlock the hidden Microsoft Advanced Protection Service (MAPS) via Group Policy or PowerShell, and provides additional configuration tips for ransomware protection, signature updates, and cloud‑based blocking.

Malware ProtectionPowerShellWindows Defender

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Enabling Microsoft MAPS Advanced Protection in Windows Defender