WhatsApp has fixed a security bug in its iOS and Mac apps that was being used to stealthily hack into the Apple devices of “specific targeted users.” The vulnerability, known officially as CVE-2025-55177, was used alongside a separate flaw found in iOS and Macs, which Apple fixed last week and tracks as CVE-2025-43300. Apple said at the time that the flaw was used in an “extremely sophisticated attack against specific targeted individuals.” Now we know that dozens of WhatsApp users were targeted with this pair of flaws. Donncha Ó Cearbhaill, who heads Amnesty International’s Security Lab, described the attack in a post on X as an “advanced spyware campaign” that targeted users over the past 90 days, or since the end of May. Ó Cearbhaill described the pair of bugs as a “zero-click” attack, meaning it does not require any interaction from the victim, such as clicking a link, to compromise their device. The two bugs chained together allow an attacker to deliver a malicious exploit through WhatsApp that’s capable of stealing data from the user’s Apple device. Per Ó Cearbhaill, who posted a copy of the threat notification that WhatsApp sent to affected users, the attack was able to “compromise your device and the data it contains, including messages.”