The get_attachment_link function in Template.pm in Bugzilla 2.x and 3.x before 3.6.10, 3.7.x and 4.0.x before 4.0.7, 4.1.x and 4.2.x before 4.2.2, and 4.3.x before 4.3.2 does not check whether an attachment is private before presenting the attachment description within a public comment, which allows remote attackers to obtain sensitive description information by reading a comment.

template/en/default/list/list.js.tmpl in Bugzilla 2.x and 3.x before 3.6.9, 3.7.x and 4.0.x before 4.0.6, and 4.1.x and 4.2.x before 4.2.1 does not properly handle multiple logins, which allows remote attackers to conduct cross-site scripting (XSS) attacks and obtain sensitive bug information via a crafted web page.

Bugzilla 3.5.x and 3.6.x before 3.6.9, 3.7.x and 4.0.x before 4.0.6, and 4.1.x and 4.2.x before 4.2.1, when the inbound_proxies option is enabled, does not properly validate the X-Forwarded-For HTTP header, which allows remote attackers to bypass the lockout policy via a series of authentication requests with (1) different IP address strings in this header or (2) a long string in this header.

Cross-site request forgery (CSRF) vulnerability in xmlrpc.cgi in Bugzilla 4.0.2 through 4.0.4 and 4.1.1 through 4.2rc2, when mod_perl is used, allows remote attackers to hijack the authentication of arbitrary users for requests that modify the product's installation via the XML-RPC API.

Bugzilla 2.x and 3.x before 3.4.14, 3.5.x and 3.6.x before 3.6.8, 3.7.x and 4.0.x before 4.0.4, and 4.1.x and 4.2.x before 4.2rc2 does not reject non-ASCII characters in e-mail addresses of new user accounts, which makes it easier for remote authenticated users to spoof other user accounts by choosing a similar e-mail address.

Cross-site request forgery (CSRF) vulnerability in jsonrpc.cgi in Bugzilla 3.5.x and 3.6.x before 3.6.8, 3.7.x and 4.0.x before 4.0.4, and 4.1.x and 4.2.x before 4.2rc2 allows remote attackers to hijack the authentication of arbitrary users for requests that use the JSON-RPC API.

Cross-site request forgery (CSRF) vulnerability in attachment.cgi in Bugzilla 2.x, 3.x, and 4.x before 4.2rc1 allows remote attackers to hijack the authentication of arbitrary users for requests that upload attachments.

The User.offer_account_by_email WebService method in Bugzilla 2.x and 3.x before 3.4.13, 3.5.x and 3.6.x before 3.6.7, 3.7.x and 4.0.x before 4.0.3, and 4.1.x through 4.1.3, when createemailregexp is not empty, does not properly handle user_can_create_account settings, which allows remote attackers to create user accounts by leveraging a token contained in an e-mail message.

Cross-site request forgery (CSRF) vulnerability in post_bug.cgi in Bugzilla 2.x, 3.x, and 4.x before 4.2rc1 allows remote attackers to hijack the authentication of arbitrary users for requests that create bug reports.

Multiple cross-site scripting (XSS) vulnerabilities in Bugzilla 2.x and 3.x before 3.4.13, 3.5.x and 3.6.x before 3.6.7, 3.7.x and 4.0.x before 4.0.3, and 4.1.x through 4.1.3, when debug mode is used, allow remote attackers to inject arbitrary web script or HTML via vectors involving a (1) tabular report, (2) graphical report, or (3) new chart.