The CAPTCHA functionality in php-Nuke 6.0 through 7.9 uses fixed challenge/response pairs that only vary once per day based on the User Agent (HTTP_USER_AGENT), which allows remote attackers to bypass CAPTCHA controls by fixing the User Agent, performing a valid challenge/response, then replaying that pair in the random_num and gfx_check parameters.

Cross-site scripting (XSS) vulnerability in header.php in PHP-Nuke 6.0 to 7.8 allows remote attackers to inject arbitrary web script or HTML via the pagetitle parameter.

PHP-Nuke 7.6 and earlier allows remote attackers to obtain sensitive information via a direct request to (1) ipban.php, (2) db.php, (3) lang-norwegian.php, (4) lang-indonesian.php, (5) lang-greek.php, (6) a request to Web_Links with the portuguese language (lang-portuguese.php), (7) a request to Web_Links with the indonesian language (lang-indonesian.php), (8) a request to the survey module with the indonesian language (lang-indonesian.php), (9) a request to the Reviews module with the portuguese language, or (10) a request to the Journal module with the portuguese language, which reveal the path in an error message.

Multiple cross-site scripting (XSS) vulnerabilities in PHP-Nuke 6.x through 7.6 allow remote attackers to inject arbitrary web script or HTML via the (1) username parameter in the Your_Account module, (2) avatarcategory parameter in the Your_Account module, or (3) lid parameter in the Downloads module.

Multiple cross-site scripting (XSS) vulnerabilities in PHP-Nuke 6.x to 7.6 allow remote attackers to inject arbitrary web script or HTML via the (1) min parameter to the Search module, (2) the categories parameter to the FAQ module, or (3) the ltr parameter to the Encyclopedia module. NOTE: the bid parameter issue in banners.php is already an item in CVE-2005-1000.

modules.php in PHP-Nuke 6.x to 7.6 allows remote attackers to obtain sensitive information via a direct request to (1) my_headlines, (2) userinfo, or (3) search, which reveals the path in a PHP error message.

SQL injection vulnerability in the Top module for PHP-Nuke 6.x through 7.6 allows remote attackers to execute arbitrary SQL commands via the querylang parameter.

Multiple cross-site scripting (XSS) vulnerabilities in Php-Nuke 7.5 allow remote attackers to inject arbitrary HTML or web script via (1) the newdownloadshowdays parameter in a NewDownloads operation or (2) the newlinkshowdays parameter in a NewLinks operation.

Php-Nuke 7.5 allows remote attackers to determine the full path of the web server via invalid or missing arguments to (1) db.php, (2) mainfile.php, (3) Downloads/index.php, or (4) Web_Links/index.php, which lists the path in a PHP error message.

Multiple cross-site scripting (XSS) vulnerabilities in Php-Nuke 6.x through 7.3 allow remote attackers to inject arbitrary HTML or web script into the (1) optionbox parameter in the News module, (2) date parameter in the Statistics module, (3) year, month, and month_1 parameters in the Stories_Archive module, (4) mode, order, and thold parameters in the Surveys module, or (5) a SQL statement to index.php, as processed by mainfile.php.