In spring AMQP versions 1.0.0 to 2.4.16 and 3.0.0 to 3.0.9 , allowed list patterns for deserializable class names were added to Spring AMQP, allowing users to lock down deserialization of data in messages from untrusted sources; however by default, when no allowed list was provided, all classes could be deserialized.

Specifically, an application is vulnerable if

the SimpleMessageConverter or SerializerMessageConverter is used

the user does not configure allowed list patterns

untrusted message originators gain permissions to write messages to the RabbitMQ broker to send malicious content