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Cybersecurity researchers have attributed the April 2026 DigiCert security incident to a threat activity cluster dubbed CylindricalCanine
A recent email compromise by Chinese APT group Storm-0558 highlights a lack of access to security logging by many Microsoft 365 license holders, prompting calls from researchers to abolish it.
This is the first incident where a threat actor from the country appears to be laying the groundwork for disruptive attacks in the future, researchers say.