Security breach
Could this be a security breach or is this legit?
iPhone XS Max
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Not a security breach, just calendar spam added from a bogus website.
If running iOS 13 or earlier versions, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account.
If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account.