Microsoft has announced that Windows 10 will stop trusting certificates issued by Chinese Certificate Authorities WoSign and StartCom, which have failed to maintain proper security standards.
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GlobalSign has revealed that a known issue in its certification process has caused various secure websites to become inaccessible for users. The access should be restored in a few days.
Trend Micro has detected a malvertising campaign against web users in Japan. It turns out that the ads were using a certificate issued by Let's Encrypt. The ads led to sites which would infect PCs.