CVE-2007-5416

Drupal 5.2 and earlier does not properly unset variables when the input
data includes a numeric parameter with a value matching an alphanumeric
parameter’s hash value, which allows remote attackers to execute arbitrary
PHP code by invoking the drupal_eval function through a callback parameter
to the default URI, as demonstrated by the _menu[callbacks][1][callback]
parameter. NOTE: it could be argued that this vulnerability is due to a
bug in the unset PHP command (CVE-2006-3017) and the proper fix should be
in PHP; if so, then this should not be treated as a vulnerability in
Drupal.

Notes