Cross-site scripting (XSS) vulnerability in the private message box implementation (privmsg.php) in phpBB 2.0.x allows remote authenticated users to inject arbitrary web script or HTML via the "Message body" field in a message to a non-existent user.

PHP remote file inclusion vulnerability in admin/admin_topic_action_logging.php in Admin Topic Action Logging Mod 0.95 and earlier, as used in phpBB 2.0 up to 2.0.21, allows remote attackers to execute arbitrary PHP code via a URL in the phpbb_root_path parameter.

phpBB 2.0.21 does not properly handle pathnames ending in %00, which allows remote authenticated administrative users to upload arbitrary files, as demonstrated by a query to admin/admin_board.php with an avatar_path parameter ending in .php%00.

usercp_avatar.php in PHPBB 2.0.20, when avatar uploading is enabled, allows remote attackers to use the server as a web proxy by submitting a URL to the avatarurl parameter, which is then used in an HTTP GET request.

PHP remote file inclusion vulnerability in template.php in phpBB 2 allows remote attackers to execute arbitrary PHP code via a URL in the page parameter. NOTE: followup posts have disputed this issue, stating that template.php does not appear in phpBB and does not use a $page variable. It is possible that this is a site-specific vulnerability, or an issue in a mod

PHP remote file inclusion vulnerability in /includes/kb_constants.php in Knowledge Base Mod for PHPbb 2.0.2 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the module_root_path parameter.

Direct static code injection vulnerability in includes/template.php in phpBB allows remote authenticated users with write access to execute arbitrary PHP code by modifying a template in a way that (1) bypasses a loose ".*" regular expression to match BEGIN and END statements in overall_header.tpl, or (2) is used in an eval statement by includes/bbcode.php for bbcode.tpl.

Multiple cross-site scripting (XSS) vulnerabilities in phpBB 2.0.19 allow remote attackers to inject arbitrary web script or HTML via the (1) Site Description field in (a) admin_board.php, the (2) Group name and (3) Group description fields in (b) admin_groups.php and (c) groupcp.php, the (4) Theme Name field in (d) admin_styles.php, and the (5) Rank Title field in (e) admin_ranks.php. NOTE: the profile.php/Current password vector is already covered by CVE-2006-1603.

Cross-site scripting (XSS) vulnerability in profile.php in phpBB 2.0.19 allows remote attackers to inject arbitrary web script or HTML via the cur_password parameter. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

The gen_rand_string function in phpBB 2.0.19 uses insufficiently random data (small value space) to create the activation key ("validation ID") that is sent by e-mail when establishing a password, which makes it easier for remote attackers to obtain the key and modify passwords for existing accounts or create new accounts.