Description
The JSONSerializer and CBORSerializer in APScheduler (all versions including 3.10.x and 4.0.0a5) are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization. The unmarshal_object function allows for arbitrary class instantiation and state injection by dynamically importing modules and calling __setstate__ on any class available in the Python environment. An attacker can exploit this by submitting a specially crafted JSON or CBOR payload to an application using these serializers
References
gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6
github.com/agronholm/apscheduler
gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6