Microsoft Defender Releases Zero day Alerts!

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Microsoft has issued a security alert about two new zero‑day vulnerabilities in Microsoft Defender that are already being actively exploited in real-world attacks. 

The two vulnerabilities

  1. CVE‑2026‑41091 (High severity – privilege escalation)

    • A flaw in the Microsoft Malware Protection Engine
    • Lets an attacker gain SYSTEM-level privileges (full control of the machine) 

  2. CVE‑2026‑45498 (Moderate severity – denial of service)

    • Impacts the Defender Antimalware Platform
    • Can be used to crash or disable protection, opening the door for further attacks 

👉 Both are confirmed zero‑days, meaning attackers were exploiting them before patches were available. 

 Why this matters

  • These bugs affect core Defender components used across:
    • Windows 10/11
    • Windows Server
    • System Center Endpoint Protection
  • Successful exploitation could:
    • Give attackers full admin control
    • Let them disable antivirus protections
    • Or knock systems offline with DoS 

The U.S. cybersecurity agency (CISA) has already added these flaws to its Known Exploited Vulnerabilities catalog, which means they’re considered actively dangerous and high priority.

 Fix / mitigation (what to do)

Microsoft has already pushed patches, and most systems should update automatically.

✅ Required versions (patched)

  • Engine: 1.1.26040.8 or newer
  • Platform: 4.18.26040.7 or newer 

✅ What you should do right now

As a sysadmin, I’d treat this as “verify, don’t assume”:

  • Check Defender updates manually:
    • Windows Security → Virus & Threat Protection
    • → Protection Updates → Check for updates
  • Confirm version numbers on endpoints
  • Verify:
    • WSUS / SCCM isn’t delaying definition + platform updates
    • Offline or golden images aren’t stuck on older engine versions
  • Monitor for:
    • Privilege escalation attempts
    • Defender service crashes / instability

Microsoft says auto-update is enabled by default—but they explicitly recommend verifying it actually applied.


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