Plugin/passwordauth.pm (aka the passwordauth plugin) in ikiwiki 1.34 through 2.47 allows remote attackers to bypass authentication, and login to any account for which an OpenID identity is configured and a password is not configured, by specifying an empty password during the login sequence.

Multiple cross-site scripting (XSS) vulnerabilities in the meta plugin (Plugin/meta.pm) in ikiwiki before 3.20120516 allow remote attackers to inject arbitrary web script or HTML via the (1) author or (2) authorurl meta tags.

Cross-site scripting (XSS) vulnerability in the htmlscrubber in Ikiwiki before 1.1.46 allows remote attackers to inject arbitrary web script or HTML via title contents.

ikiwiki before 3.20110328 does not ascertain whether the htmlscrubber plugin is enabled during processing of the "meta stylesheet" directive, which allows remote authenticated users to conduct cross-site scripting (XSS) attacks via crafted Cascading Style Sheets (CSS) token sequences in (1) the default stylesheet or (2) an alternate stylesheet.