Deserialization of Untrusted Data
An issue was discovered in phpMyAdmin. Due to a bug in serialized string parsing, it was possible to bypass the protection offered by PMA_safeUnserialize() function. All 4.6.x versions (prior to 4.6.5), 4.4.x versions (prior to 22.214.171.124), and 4.0.x versions (prior to 126.96.36.199) are affected.
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.