[wp-trac] [WordPress Trac] #53950: `wp_schedule_single_event()` may add incorrectly populate the cron array.

[WordPress Trac]

#53950: `wp_schedule_single_event()` may add incorrectly populate the cron array.
---------------------------+-----------------------------
 Reporter:  peterwilsoncc  |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Cron API       |    Version:  5.2
 Severity:  normal         |   Keywords:
  Focuses:                 |
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 In [44917] for #44818 `wp_schedule_single_event()` started casting the
 result of `_get_cron_array()` to an array.

 As `_get_cron_array()` can return `false` if the option does not exist/is
 of incorrect type then this can result in a malformed cron array (see
 #53940 for discussion).

 If the getter returns `false`, `wp_schedule_single_event()` will set the
 cron array to `[ false ]`. The single event being scheduled will then be
 appended to the malformed cron array.

 This is an edge case as it relies on either the `cron` option to be
 malformed or deleted. WordPress populates the cron array with recurring
 events during installation and `wp_schedule_event()` doesn't share this
 problem.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53950>
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