WoSign and StartCom CA will be distrusted soon are distrusted by major browsers.
I switched to GeoTrust and Comodo.
Google Security Blog:
https://security.googleblog.com/2016/10/distrusting-wosign-and-startcom.html
Mozilla’s Announcement:
https://blog.mozilla.org/security/2016/10/24/distrusting-new-wosign-and-startcom-certificates/
Update from Apple:
https://support.apple.com/en-us/HT204132
A list of WoSign issues from Mozilla:
https://wiki.mozilla.org/CA:WoSign_Issues
Article from former StartCom employee:
(Original link)
More articles:
WoSign’s secret purchase of StartCom; WoSign threatened legal actions over the disclosure
http://www.percya.com/2016/09/wosigns-secret-purchase-of-startcom.html
Why I stopped using StartSSL (Hint: it involves a Chinese company)