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Microsoft Defender Wrongly Flags DigiCert Certs as Trojan:Win32/Cerdigent.A!dha

Summary by BleepingComputer
Microsoft Defender is detecting legitimate DigiCert root certificates as Trojan:Win32/Cerdigent.A!dha, resulting in widespread false-positive alerts, and in some cases, removing certificates from Windows.

6 Articles

Microsoft Defender was wrong with a DigiCert root certificate that was identified as a Trojan. An error related to an overzealous reaction following a security flaw.

Imagine waking up and realizing that your antivirus removed essential certificates that allow your computer to rely on legitimate websites, apps and services. That's exactly what happened to thousands of users after a serious error involving Microsoft Defender and DigiCert certificates. The problem is linked to the false positive Trojan:Win32/Cerdigient.A!dha, which led the Windows security system to identify legitimate root certificates as a th…

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BleepingComputer broke the news on Sunday, May 3, 2026.
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