From the Enlace eliminado, this maintenance release addresses 18 bugs with version 3.4 and 3.4.1, including:
[*=left]Fixes some issues in the admin area where some older browsers (IE7, in particular) may slow down, lag, or freeze.
[*=left]Fixes an issue where a theme may not preview correctly, or its screenshot may not be displayed.
[*=left]Fixes the use of multiple trackback URLs in a post.
[*=left]Prevents improperly sized images from being uploaded as headers from the customizer.
[*=left]Ensures proper error messages can be shown to PHP4 installs. (WordPress requires PHP 5.2.4 or later.)
[*=left]Fixes handling of oEmbed providers that only return XML responses.
[*=left]Addresses pagination problems with some category permalink structures.
[*=left]Adds more fields to be returned from the XML-RPC wp.getPost method.
[*=left]Avoids errors when updating automatically from very old versions of WordPress (pre-3.0).
[*=left]Fixes problems with the visual editor when working with captions.
Additionally: Version 3.4.2 fixes a few security issues and contains some security hardening. These issues were discovered and addressed by the WordPress security team:
[*=left]Fix unfiltered HTML capabilities in multisite.
[*=left]Fix possible privilege escalation in the Atom Publishing Protocol endpoint.
[*=left]Allow operations on network plugins only through the network admin.
[*=left]Hardening: Simplify error messages when uploads fail.
[*=left]Hardening: Validate a parameter passed to wp_get_object_terms().
A full log of the changes made for 3.4.2 can be found at Enlace eliminado
[h=2]List of Files Revised[/h]
wp-load.phpwp-includes/class-wp-atom-server.phpwp-includes/taxonomy.phpwp-includes/version.phpwp-includes/js/wp-lists.jswp-includes/js/tinymce/plugins/wpeditimage/editor_plugin.jswp-includes/js/tinymce/plugins/wpeditimage/editor_plugin_src.jswp-includes/js/tinymce/langs/wp-langs.phpwp-includes/js/tinymce/wp-tinymce.js.gzwp-includes/js/plupload/wp-plupload.jswp-includes/js/plupload/wp-plupload.dev.jswp-includes/js/imgareaselect/jquery.imgareaselect.dev.jswp-includes/js/imgareaselect/jquery.imgareaselect.jswp-includes/js/wp-lists.dev.jswp-includes/class-wp-customize-control.phpwp-includes/class-wp-theme.phpwp-includes/theme.phpwp-includes/functions.phpwp-includes/load.phpwp-includes/class-wp-xmlrpc-server.phpwp-includes/formatting.phpwp-includes/rewrite.phpwp-includes/capabilities.phpwp-includes/class-oembed.phpwp-includes/css/editor.dev.csswp-includes/css/editor.csswp-includes/class-wp-editor.phpreadme.htmlwp-admin/includes/class-wp-ms-themes-list-table.phpwp-admin/includes/class-wp-upgrader.phpwp-admin/includes/meta-boxes.phpwp-admin/includes/class-wp-plugins-list-table.phpwp-admin/includes/update-core.phpwp-admin/includes/class-wp-themes-list-table.phpwp-admin/js/post.dev.jswp-admin/js/link.jswp-admin/js/customize-controls.jswp-admin/js/link.dev.jswp-admin/js/post.jswp-admin/js/customize-controls.dev.jswp-admin/index.phpwp-admin/plugins.phpwp-admin/setup-config.php
wp-admin/about.php