Cal.com Broken Access Controls Exposes Millions of Bookings and Leads to Complete Account Takeover

Cal.com, an open-source scheduling platform that millions of people use to book meetings and manage their calendars, recently faced a serious security problem. The platform provides an alternative to tools like Calendly, offering features like calendar syncing, team scheduling, and video conferencing. On January 26, 2026, security researchers discovered that attackers could break into any […]

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