cakephp/queue's Incomplete Comparison in getUniqueId vulnerable to collisions

Impact

For jobs with shouldBeUnique = true the queue plugin will generate a 'unique identifier' based on the job class, method and parameters. If user data is supplied, a malicious user could create collisions, resulting in legitimate jobs being dropped.

Patches

Upgrade to 2.3.1

Workarounds

You can disable shouldBeUnique and handle idempotency in application code.