The Super Stage WP WordPress plugin through 1.0.1 unserializes user input via REQUEST, which could allow unauthenticated users to perform PHP Object Injection when a suitable gadget is present on the blog.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Potential Mitigations
- Make fields transient to protect them from deserialization.
- An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.