WordPress is prone to an HTML-injection vulnerability.
Attacker-supplied HTML and script code would be executed in the context of the affected website, potentially allowing for the theft of cookie-based authentication credentials. An attacker could also exploit this issue to control how the site is rendered to the user; other attacks are also possible.
WordPress version 2.0.0 is reportedly vulnerable; other versions may also be affected.
An example has been provided:
<strong>" onfocus="alert(1)" onblur="alert(1)</strong>