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Malicious actors could leverage the vulnerability, which stems from improper user check error management in the two-factor REST API action, to facilitate high-privileged account breaches that could then be used for additional attacks, according to Defiant, a WordPress security provider.

While WhatsApp proceeded to disable the "Eden" exploit leveraged by NSO Group, the Israeli firm proceeded to create the "Erised" vector to target the app's users until May 2020, noted a court filing from Meta, which also noted that NSO Group, and not its customers, was primarily behind the spyware attacks.

Such an issue stems from Microsoft Bookings enabling the creation of Shared Booking Pages by default for users with proper Microsoft 365 licenses and automated Booking Page name-based email address generation, which could be exploited to create legitimate-looking email addresses for malicious activity, according to a report from Cyberis.