DigiCert hit by network compromise
Incident
Summary
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DigiCert disclosed an early April support environment compromise that exposed initialization codes for approved EV code-signing certificate orders, creating a path for malware-signing abuse and certificate revocation. The intrusion matters because the stolen access was enough to obtain certificates across customer accounts and certificate authorities. DigiCert later revoked 60 code-signing certificates, including 27 linked to Zhong Stealer.
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How related:
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About this happening:
**Microsoft Defender** began falsely flagging valid **DigiCert root certificates** as **Trojan:Win32/Cerdigent.A!dha**, creating widespread false positives and risking certificate...
Microsoft Defender false-positively flags DigiCert root certificates and removes some from Windows trust store
Security Tool/ServiceHow related: 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.
About this happening: **Microsoft Defender** began falsely flagging valid **DigiCert root certificates** as **Trojan:Win32/Cerdigent.A!dha**, creating widespread false positives and risking certificate...
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Vulnerability
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Sources 1
About this happening:
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Malware Activity
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Sources 1
About this happening:
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Campaign
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Sources 1
About this happening:
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Timeline
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04.05.2026 15:46 1 articles · 23d ago
DigiCert revokes certificates and hardens support access
Mitigation Patch UpdateBy April 17, DigiCert revoked 60 certificates tied to the support-portal compromise, including 27 explicitly linked to the threat actor and 11 used to sign Zhong Stealer, and canceled pending orders to close attacker access. DigiCert also enforced multi-factor authentication for administrative workflows, blocked access to initialization codes from proxied support users, restricted file types for support chat and Salesforce case attachments, and improved logging.
Show sources
- DigiCert Revokes Certificates After Support Portal Hack — www.securityweek.com — 04.05.2026 15:46
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03.05.2026 21:11 1 articles · 24d ago
DigiCert hit by network compromise
Initial DisclosureAttackers began by sending DigiCert support staff **malicious ZIP files disguised as screenshots** in **early April**. Repeated blocked attempts were followed by compromise of one support analyst device and then a second system.
Show sources
- Microsoft Defender wrongly flags DigiCert certs as Trojan:Win32/Cerdigent.A!dha — www.bleepingcomputer.com — 03.05.2026 21:11