The application accepts serialized Java objects from untrusted sources (e.g., HTTP parameters, cookies, or headers) without proper validation. When the application calls readObject() , it processes the malicious payload provided by ysoserial , triggering a "gadget chain" that executes system commands.
. Always ensure you have explicit permission before testing any system. Additionally, be cautious when downloading JAR files from non-official mirrors, as they can be tampered with. ysoserial-0.0.4-all.jar download
Always run security tools like ysoserial inside a Virtual Machine (VM) or a Docker container to prevent accidental damage to your host system. ysoserial-0.0.4-all.jar download