The CAPTCHA implementation in (1) Pligg 9.9.5 and possibly (2) Francisco Burzi PHP-Nuke 8.1 provides a critical random number (the ts_random value) within the URL in the SRC attribute of an IMG element, which allows remote attackers to pass the CAPTCHA test via a calculation that combines this value with the current date and the HTTP User-Agent string.
SQL injection vulnerability in story.php in Pligg CMS Beta 9.9.0 allows remote attackers to execute arbitrary SQL commands via the id parameter. NOTE: this might overlap CVE-2008-1774.
login.php in Pligg CMS 9.5 uses a guessable confirmation code when resetting a forgotten password, which allows remote attackers with knowledge of a username to reset that user's password by calculating the confirmationcode parameter.