admin/index.php in Advanced Poll 2.0.0 through 2.0.5-dev allows remote attackers to bypass authentication and gain administrator privileges by obtaining a valid session identifier and setting the uid parameter to 1.
SQL injection vulnerability in include/class_poll.php in Advanced Poll 2.0.4 allows remote attackers to execute arbitrary SQL commands via the User-Agent HTTP header.
include/class_poll.php in Advanced Poll 2.0.4 uses the HTTP_X_FORWARDED_FOR (X-Forwarded-For HTTP header) to identify the IP address of a client, which makes it easier for remote attackers to spoof the source IP and bypass voting restrictions.