Cross-site scripting (XSS) vulnerability in wp-admin/press-this.php in WordPress before 2.8.6 allows remote authenticated users to inject arbitrary web script or HTML via the s parameter (aka the selection variable).
http://www.openwall.com/lists/oss-security/2009/11/16/1
http://www.openwall.com/lists/oss-security/2009/11/15/3
http://www.openwall.com/lists/oss-security/2009/11/15/2
http://wordpress.org/development/2009/11/wordpress-2-8-6-security-release/
http://secunia.com/advisories/37332
http://core.trac.wordpress.org/ticket/11119
http://core.trac.wordpress.org/attachment/ticket/11119/press-this.002.diff
http://core.trac.wordpress.org/attachment/ticket/11119/press-this-xss-bug-11-10-2009.patch