Apple has fixed a zero-day bug that was used by the Paragon spyware to hack iPhones of two European journalists.
The Citizen Lab report mentioned that the flaw was mitigated in iOS 18.3.1 that was released on February 10.
The security update initially only addressed an unrelated flaw, but was later updated to include details about a logic issue in processing media via an iCloud Link.
The flaw was exploited in an attack against specific individuals, including Italian journalist Ciro Pellegrino and another European journalist.
Apple did not disclose the existence of this patched flaw until four months after the iOS update release.
The Paragon spyware scandal started in January with WhatsApp notifying users of being targeted with Graphite spyware.
Several iPhone users later received notifications from Apple about being targets of mercenary spyware.
The Citizen Lab's findings confirmed that two journalists targeted with Apple's notification were hacked with Paragon spyware.
It's uncertain if all Apple users who received the notification were targeted with Graphite.
Apple did not provide a comment on the reason for the delayed disclosure of the patched flaw.
The report mentions users in 100 countries received notifications about being affected by the spyware campaign.