The phpMyAdmin development team reports:
It was possible to manipulate the PHP session superglobal using some of the Swekey authentication code. This could open a path for other attacks.
An unsanitized key from the Servers array is written in a comment of the generated config. An attacker can modify this key by modifying the SESSION superglobal array. This allows the attacker to close the comment and inject code.
Through a possible bug in PHP running on Windows systems a NULL byte can truncate the pattern string allowing an attacker to inject the /e modifier causing the preg_replace function to execute its second argument as PHP code.
Fixed filtering of a file path in the MIME-type transformation code, which allowed for directory traversal.