The NSO Group, an Israeli firm that sells software for invisibly tracking mobile phones, is believed to be responsible for leveraging three security vulnerabilities in Apple devices to spy on journalists and dissidents. The software can reportedly be used to access passwords, emails, text messages, calls, contacts and more. Apple fixed the security flaws 10 days after two researchers provided the tip. The company urges all users to download the latest version of iOS. “Apple on Thursday released a patched version of its mobile software, iOS 9.3.5,” reports The New York Times. “Users can get the patch through a normal software update.”