The vulnerability stems from using Python's unsafe pickle module for serialization/deserialization:

1. export_dashboards in models/core.py used pickle.dumps() to serialize dashboards, creating attack vectors in exported files
2. import_dashboards in views/core.py used pickle.load() on user-controlled input, enabling RCE via malicious pickle payloads
3. The patch replaced pickle with JSON serialization and introduced a safe decoder, confirming these were the vulnerable points
4. CVE description explicitly mentions unsafe load method from pickle library
5. Exploit PoC demonstrates weaponized pickle payloads being uploaded through the dashboard import functionality