Stewart McIntyre has reported a vulnerability in the Login With Ajax plugin for WordPress, which can be exploited by malicious people to conduct cross-site scripting attacks.

Input passed via JSON callback is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

The vulnerability is reported in versions prior to 3.0.4.1.

Solution
Update to version 3.0.4.1.

Provided and/or discovered by
Stewart McIntyre, Dell SecureWorks

Changelog
Further details available to Secunia VIM customers

Original Advisory
WordPress Login With Ajax Plugin:
http://plugins.trac.wordpress.org/changeset/541069
http://wordpress.org/extend/plugins/login-with-ajax/changelog/

Dell SecureWorks:
http://www.secureworks.com/research/advisories/SWRX-2012-003/

Deep Links
Links available to Secunia VIM customers