Pierluigi Paganini
August 12, 2026
Chaotic Eclipse released a PoC for ShieldBreak, a Microsoft Defender zero-day that bypasses the CVE-2026-50656 patch and could enable SYSTEM-level code execution. Security researcher Chaotic Eclipse, also known as INFINITE NIGHTMARE, MSNightmare and Nightmare-Eclipse, released a PoC for ShieldBreak, a Microsoft Defender zero-day. The flaw bypasses the patch for CVE-2026-50656 (RoguePlanet), a race condition that […]
Pierluigi Paganini
April 23, 2026
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds a flaw in Microsoft Defender to its Known Exploited Vulnerabilities catalog The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a flaw in Microsoft Defender, tracked as CVE-2026-33825 (CVSS score of 7.8), to its Known Exploited Vulnerabilities (KEV) catalog. CVE-2026-33825 is a Microsoft Defender flaw that can be exploited […]
Pierluigi Paganini
April 18, 2026
Attackers exploit three Microsoft Defender zero-days, code-named BlueHammer, RedSun, and UnDefend, to gain elevated access. Attackers are exploiting three recently disclosed zero-day flaws in Microsoft Defender to gain higher privileges on compromised systems. The vulnerabilities, called BlueHammer, RedSun, and UnDefend, were revealed by a researcher known as Chaotic Eclipse after criticizing Microsoft’s handling of the […]
Pierluigi Paganini
November 24, 2023
Microsoft announced this week it will pay up to $20,000 for security vulnerabilities in its Defender products. Microsoft launched its new Microsoft Defender Bounty Program with a focus on Defender products and services. The company will pay up to $20,000 for the vulnerabilities in its Defender products. The bug bounty program starts with Defender for […]
Pierluigi Paganini
January 14, 2022
A weakness in the Microsoft Defender antivirus can allow attackers to retrieve information to use to avoid detection. Threat actors can leverage a weakness in Microsoft Defender antivirus to determine in which folders plant malware to avoid the AV scanning. Microsoft Defender allows users to exclude locations on their machines that should be excluded from […]
Pierluigi Paganini
March 21, 2021
Microsoft announced that its Defender Antivirus and System Center Endpoint Protection now protects users against attacks exploiting Exchange Server vulnerabilities. Microsoft announced this week that Defender Antivirus and System Center Endpoint Protection now provide automatic protection against attacks exploiting the recently disclosed ProxyLogon vulnerabilities in Microsoft Exchange. “Today, we have taken an additional step to […]
