The Drupal.checkPlain function in Drupal 6.0 only escapes the first instance of a character in ECMAScript, which allows remote attackers to conduct cross-site scripting (XSS) attacks.
The OpenID module in Drupal 6.x before 6.18, and the OpenID module 5.x before 5.x-1.4 for Drupal, violates the OpenID 2.0 protocol by not verifying the openid.returnto value, which allows remote attackers to bypass authentication by leveraging an assertion from an OpenID provider.
The comment module in Drupal 5.x before 5.23 and 6.x before 6.18 allows remote authenticated users with certain privileges to bypass intended access restrictions and reinstate removed comments via a crafted URL, related to an "unpublishing bypass" issue.
The upload module in Drupal 5.x before 5.23 and 6.x before 6.18 does not properly support case-insensitive filename handling in a database configuration, which allows remote authenticated users to bypass the intended restrictions on downloading a file by uploading a different file with a similar name.
The user module in Drupal 5.x before 5.11 and 6.x before 6.5 might allow remote authenticated users to bypass intended login access rules and successfully login via unknown vectors.
The core BlogAPI module in Drupal 5.x before 5.11 and 6.x before 6.5 does not properly validate unspecified content fields of an internal Drupal form, which allows remote authenticated users to bypass intended access restrictions via modified field values.
The validation functionality in the core upload module in Drupal 6.x before 6.5 allows remote authenticated users to bypass intended access restrictions and "attach files to content," related to a "logic error."
The Upload module in Drupal 6.x before 6.4 allows remote authenticated users to edit nodes, delete files, and download unauthorized attachments via unspecified vectors.
The private filesystem in Drupal 5.x before 5.10 and 6.x before 6.4 trusts the MIME type sent by a web browser, which allows remote authenticated users to conduct cross-site scripting (XSS) attacks by uploading files containing arbitrary web script or HTML.
Multiple cross-site request forgery (CSRF) vulnerabilities in forms in Drupal 6.x before 6.4 allow remote attackers to perform unspecified actions via unknown vectors, related to improper token validation for (1) cached forms and (2) forms with AHAH elements.
Cross-site scripting (XSS) vulnerability in the output filter in Drupal 5.x before 5.10 and 6.x before 6.4 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
Unrestricted file upload vulnerability in the BlogAPI module in Drupal 5.x before 5.10 and 6.x before 6.4 allows remote authenticated users to execute arbitrary code by uploading a file with an executable extension, which is not validated.
Multiple cross-site request forgery (CSRF) vulnerabilities in Drupal 5.x before 5.10 and 6.x before 6.4 allow remote attackers to hijack the authentication of administrators for requests that (1) add or (2) delete user access rules.
Drupal security team released an advisory describing multiple security issues affecting Drupal 5.x and 6.x - SA-2008-044:
http://drupal.org/node/280571
Advisory includes: - cross site scripting issues - cross site request forgeries - session fixation issues - SQL injection
Fixed in upstream versions: 5.8 and 6.3
Upstream patches for 5.7/6.2: http://drupal.org/files/sa-2008-044/SA-2008-044-5.7.patch http://drupal.org/files/sa-2008-044/SA-2008-044-6.2.patch
Session fixation vulnerability in Drupal 5.x before 5.9 and 6.x before 6.3, when contributed modules "terminate the current request during a login event," allows remote attackers to hijack web sessions via unknown vectors.
Cross-site request forgery (CSRF) vulnerability in Drupal 5.x before 5.8 and 6.x before 6.3 allows remote attackers to perform administrative actions via vectors involving deletion of "translated strings."
SQL injection vulnerability in the Schema API in Drupal 6.x before 6.3 allows remote attackers to execute arbitrary SQL commands via vectors related to "an inappropriate placeholder for 'numeric' fields."
Cross-site request forgery (CSRF) vulnerability in Drupal 6.x before 6.3 allows remote attackers to perform administrative actions via vectors involving deletion of OpenID identities.
The Drupal filterxssadmin function in 5.x before 5.8 and 6.x before 6.3 does not "prevent use of the object HTML tag in administrator input," which has unknown impact and attack vectors, probably related to an insufficient cross-site scripting (XSS) protection mechanism.
The Node Hierarchy module 5.x before 5.x-1.1 and 6.x before 6.x-1.0 for Drupal does not properly implement access checks, which allows remote attackers with "access content" permissions to bypass restrictions and modify the node hierarchy via unspecified attack vectors.
The menu system in Drupal 6 before 6.2 has incorrect menu settings, which allows remote attackers to (1) edit the profile pages of arbitrary users, and obtain sensitive information from (2) tracker and (3) blog pages, related to a missing check for the "access content" permission; and (4) allows remote authenticated users, with administration page view access, to edit content types.
Cross-site scripting (XSS) vulnerability in the Contact module (modules/contact/contact.admin.inc or modules/contact/contact.module) in Drupal Core 5.x before 5.21 and 6.x before 6.15 allows remote authenticated users with "administer site-wide contact form" permissions to inject arbitrary web script or HTML via the contact category name.
Cross-site scripting (XSS) vulnerability in the Menu module (modules/menu/menu.admin.inc) in Drupal Core 6.x before 6.15 allows remote authenticated users with permissions to create new menus to inject arbitrary web script or HTML via a menu description, which is not properly handled in the menu administration overview.
Drupal 6.x before 6.13 does not prevent users from modifying user signatures after the associated comment format has been changed to an administrator-controlled input format, which allows remote authenticated users to inject arbitrary web script, HTML, and possibly PHP code via a crafted user signature.
Cross-site scripting (XSS) vulnerability in the Forum module in Drupal 6.x before 6.13 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
Drupal 5.x before 5.19 and 6.x before 6.13 does not properly sanitize failed login attempts for pages that contain a sortable table, which includes the username and password in links that can be read from (1) the HTTP referer header of external web sites that are visited from those links or (2) when page caching is enabled, the Drupal page cache.
Drupal 6.x before 6.16 and 5.x before version 5.22 does not properly block users under certain circumstances. A user with an open session that was blocked could maintain their session on the Drupal site despite being blocked.
Locale module and dependent contributed modules in Drupal 6.x before 6.16 and 5.x before version 5.22 do not sanitize the display of language codes, native and English language names properly which could allow an attacker to perform a cross-site scripting (XSS) attack. This vulnerability is mitigated by the fact that an attacker must have a role with the 'administer languages' permission.
Drupal versions 5.x and 6.x has open redirection
Drupal 5.x and 6.x before 6.16 uses a user-supplied value in output during site installation which could allow an attacker to craft a URL and perform a cross-site scripting attack.