bolkedebruin opened a new pull request, #27740:
URL: https://github.com/apache/airflow/pull/27740

   It is possible to fully deserialize XCom values in the webserver by 
specifying a `deserialize` parameter. This creates a potential security issue 
as deserialization instantiates arbitrary objects.
   
   Custom XCom backends should implement `orm_deserialize_value` themselves if 
they want to retain the behavior. However, it is strongly suggested to 
deserialize on the client side for the above mentioned reasons.
   
   cc @uranusjr @ashb 
   
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