Deserialization of Untrusted Data
The Customizer Export/Import WordPress plugin before 0.9.5 unserializes the content of an imported file, which could lead to PHP object injection issues when an admin imports (intentionally or not) a malicious file and a suitable gadget chain is present on the blog.
CWE-502 - Deserialization of Untrusted Data
Deserialization of untrusted data vulnerabilities enable an attacker to replace or manipulate a serialized object, replacing it with malicious data. When the object is deserialized at the victim's end the malicious data is able to compromise the victim’s system. The exploit can be devastating, its impact may range from privilege escalation, broken access control, or denial of service attacks to allowing unauthorized access to the application's internal code and logic which can compromise the entire system.