Yahoo needs to improve the security it is very vulnerable to the invasion of virus. At present my two yahoo mail accounts are infested.
Yahoo is at present vulnerable to invasion of virus. It is already several weeks my two accounts are under a virus which is so smart that has managed to hide from the Yahoo technical people. I am not an expert, but by chance accidentally discover how the virus works. It let the email messages to download at the INBOX page, then only us users are interested in the following step... open the message to read them. At that moment the virus is visible because you will not be able to read the messages, me I repeat accidentally discovered the trick to overcome that barrier and read my messages. I went to the top and click on Yaho Premium, navigated then down to reach the messages number that had arrived, click there, the wheel icon for Settings appears and I click on the wheel and then the real number of messages appear and I can read the messages, the problems is over.!!!... wrong.. it is not over because it will comeback in the next arrival of messges. Yahoo need to remove the virus. I tried using Windows Defender, using my VIPRA, AvAST .and Norton and none of those antimalware applications was able to destroy the Virus. Something has to be done by experts in dealing with virus removal. Hope I will be listened.

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Jose Oltio Oltio Espinoza Cajina commented
As I am the author of above message I take then advantage to repeat my plea. The situation is serious because we customers of Yahoo can not read the messages received, more over if some one send a message to us, we will not be able to read it. It is a real serious situation that needs the participation of real experts in dealing with the control of MALWARE.