WhatsApp has announced that it has patched a vulnerability that would have allowed hackers to access with malware the chat history of users. Android 8.1 and 9 could have been susceptible to the attack. However, WhatsApp is urging all users to update their app.

Although WhatsApp says it has patched the vulnerability and does not believe that it was exploited by attackers, it is urging users to update their apps so that the patch can be applied to thwart any exploitation.

WhatsApp users—heed the recommendation and go to the Apple App Store or Google Play Store and tap the WhatsApp update button so the patch can be applied as soon as it is issued.