Unpatched Microsoft Defender flaw lets local attackers escalate privileges to SYSTEM

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A critical zero-day vulnerability tracked as CVE-2026-69414, dubbed ShieldBreak, has been disclosed in Microsoft's Malware Protection Engine, affecting Windows 10, Windows 11, and Windows Server. The flaw stems from an incomplete fix for a prior vulnerability, CVE-2026-50656, and allows an attacker who already has low-privilege code execution on a device to escalate to full SYSTEM-level privileges. Microsoft has acknowledged the issue and is working on a patch, but no fix has been released as of August 17, 2026. A public proof-of-concept exploit exists, though active in-the-wild exploitation has not yet been confirmed. Organizations are advised to monitor for abnormal privilege-crossing process activity around Defender services while awaiting an official patch.

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F-RevoCRM XSS Flaw CVE-2026-71368 Puts Logged-In Users at Risk

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ProgrammingDEV Community ·

Software Testing Explained: A Beginner's Guide to Manual and Automation Testing

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