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Cybersecurity researchers have attributed the April 2026 DigiCert security incident to a threat activity cluster dubbed CylindricalCanine
Microsoft blocked code signing certificates predominantly used by Chinese hackers and developers to sign and load malicious kernel mode drivers on breached systems by exploiting a Windows policy loophole. [...]
A suspected Chinese state-sponsored actor breached a digital certificate authority as well as government and defense agencies located in different countries in Asia as part of an ongoing campaign since at least March 2022