Eval injection vulnerability in sessions.inc in PHP Base Library (PHPLib) before 7.4a, when index.php3 from the PHPLib distribution is available on the server, allows remote attackers to execute arbitrary PHP code by including a base64-encoded representation of the code in a cookie. NOTE: this description was significantly updated on 20060605 to reflect new details after an initial vague advisory.

prepend.php3 in PHPLib before 7.2d, when register_globals is enabled for PHP, allows remote attackers to execute arbitrary scripts via an HTTP request that modifies $_PHPLIB[libdir] to point to malicious code on another server, as seen in Horde 1.2.5 and earlier, IMP before 2.2.6, and other packages that use PHPLib.