Nice .... Well at least there is a New update to fix the security flaw
WhatsApp patches security flaw that allows attackers to deliver malware through calls (excerpt)
The Facebook subsidiary said "an advanced cyber actor" exploited a security flaw and installed the malware by reaching targets on their mobile phones through WhatsApp's call function, giving hackers access to private messages, location data and other information. The company said it detected the pattern of abnormal phone calls earlier this month and updated its servers on Friday. It issued new versions of its iPhone and Android apps on Monday.