The Remote API WordPress plugin through 0.2 does not authenticate a request before deserializing user-supplied input, allowing unauthenticated attackers to inject arbitrary PHP objects, which can lead to remote code execution when a suitable gadget chain is present through another installed Remote API WordPress plugin through 0.2.
https://wpscan.com/vulnerability/eb5a7d86-4762-48ad-83bf-81f048527147/