Multiple cross-site scripting (XSS) vulnerabilities in Photo Album 2.0.53 module for phpBB allow remote attackers to inject arbitrary web script or HTML via the bsid parameter to (1) album_cat.php or (2) album_comment.php.

Cross-site scripting (XSS) vulnerability in the Calendar module for phpBB allow remote attackers to inject arbitrary web script or HTML via the start parameter to calendar_scheduler.php.

The bbencode_second_pass and make_clickable functions in bbcode.php for phpBB before 2.0.15, as used in viewtopic.php, privmsg.php, and other scripts, allow remote attackers to execute arbitrary script via a BBcode tag with a (1) javascript:, (2) applet:, (3) about:, (4) activex:, (5) chrome:, or (6) script: URI scheme, as demonstrated using the URL tag.

SQL injection vulnerability in kb.php in the Knowledge Base module for phpBB allows remote attackers to obtain sensitive information and execute SQL commands via the cat parameter.

Multiple SQL injection vulnerabilities in phpbb-Auction allow remote attackers to execute arbitrary SQL commands via the (1) u parameter to auction_rating.php or (2) ar parameter to action_offer.php.

auction_my_auctions.php in phpbb-Auction 1.2m and earlier allows remote attackers to obtain sensitive information via an invalid mode parameter, which leaks the full path in a PHP error message.

Multiple cross-site scripting (XSS) vulnerabilities in phpBB 2.0.14 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) u parameter to profile.php, (2) highlight parameter to viewtopic.php, or (3) forumname or forumdesc parameters to admin_forums.php.

PHP remote file inclusion vulnerability in viewtopic.php in phpBB 2.0.15 and earlier allows remote attackers to execute arbitrary PHP code.

Cross-site scripting (XSS) vulnerability in phpBB 2.0.16 allows remote attackers to inject arbitrary web script or HTML via nested [url] tags.

Interpretation conflict in phpBB 2.0.17, with remote avatars and avatar uploading enabled, allows remote authenticated users to inject arbitrary web script or HTML via an HTML file with a GIF or JPEG file extension, which causes the HTML to be executed by a victim who views the file in Internet Explorer, which renders malformed image types as HTML, enabling cross-site scripting (XSS) attacks. NOTE: it could be argued that this vulnerability is due to a design flaw in Internet Explorer (CVE-2005-3312) and the proper fix should be in that browser; if so, then this should not be treated as a vulnerability in phpBB.

phpBB 2.0.17 and earlier allows remote attackers to bypass protection mechanisms that deregister global variables by setting both a GET/POST/COOKIE (GPC) variable and a GLOBALS[] variable with the same name, which causes phpBB to unset the GLOBALS[] variable but not the GPC variable.

phpBB 2.0.17 and earlier, when register_globals is enabled and the session_start function has not been called to handle a session, allows remote attackers to bypass security checks by setting the $_SESSION and $HTTP_SESSION_VARS variables to strings instead of arrays, which causes an array_merge function call to fail.

phpBB 2.0.17 and earlier, when the register_long_arrays directive is disabled, allows remote attackers to modify global variables and bypass security mechanisms because PHP does not define the associated HTTP_* variables.

Multiple cross-site scripting (XSS) vulnerabilities in phpBB 2.0.17 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) error_msg parameter to usercp_register.php, (2) forward_page parameter to login.php, and (3) list_cat parameter to search.php, which are not initialized as variables.

SQL injection vulnerability in usercp_register.php in phpBB 2.0.17 allows remote attackers to execute arbitrary SQL commands via the signature_bbcode_uid parameter, which is not properly initialized.

usercp_register.php in phpBB 2.0.17 allows remote attackers to modify regular expressions and execute PHP code via the signature_bbcode_uid parameter, as demonstrated by injecting an "e" modifier into a preg_replace statement.

SQL injection vulnerability in phpBB 2 before 2.0.18 allows remote attackers to execute arbitrary SQL commands via the topic type.

A "missing request validation" error in phpBB 2 before 2.0.18 allows remote attackers to edit private messages of other users, probably by modifying certain parameters or other inputs.

phpBB 2.0.18 allows remote attackers to obtain sensitive information via a large SQL query, which generates an error message that reveals SQL syntax or the full installation path.

Cross-site scripting (XSS) vulnerability in phpBB 2.0.18, when "Allowed HTML tags" is enabled, allows remote attackers to inject arbitrary Javascript via a permitted HTML tag with " (quote) characters and active attributes such as onmouseover.