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Three zero-day vulnerabilities in Microsoft Defender are being actively exploited by threat actors.

CybersecurityApr 17, 2026score 0.172 posts · 0 replies across 1 instances
The thread discusses the exploitation of three Microsoft Defender zero-day vulnerabilities by threat actors, with two remaining unpatched. This highlights a critical cybersecurity risk as attackers leverage these vulnerabilities to compromise systems.

Claims

Three zero-day vulnerabilities in Microsoft Defender are being actively exploited by threat actors.
Parent: CybersecurityEntity: Microsoft DefenderImpact: negativeDate: Apr 17, 2026Target: Three zero-day vulnerabilities in Microsoft Defender are being actively exploited by threat actors.

Source posts

@[email protected]
Huntress posted this on X yesterday: @HuntressLabs The Huntress SOC is observing the use of Nightmare-Eclipse's BlueHammer, RedSun, and UnDefend exploitation techniques. More: The Hacker News: Three Microsoft Defender Zero-Days Actively Exploited; Two Still Unpatched https://thehackernews.com/2026/04/three-microsoft-defender-zero-days.html @thehackernews #infosec #Microsoft #vulnerability #zeroday
2 boosts · 0 favs · 0 replies · Apr 17, 2026
#infosec#microsoft#vulnerability#zeroday
@[email protected]
Three Microsoft Defender Zero-Days Actively Exploited; Two Still Unpatched https://thehackernews.com/2026/04/three-microsoft-defender-zero-days.html Read on HackerWorkspace: https://hackerworkspace.com/article/three-microsoft-defender-zero-days-actively-exploited-two-still-unpatched #cybersecurity #vulnerability #exploit
0 boosts · 0 favs · 0 replies · Apr 17, 2026
#cybersecurity#vulnerability#exploit