WordPress 4.9.1 Security And Maintenance Release

By Csaba, Miklós WP Maintenance WP Security WP SERVICES 2 December 2017

WordPress 4.9.1 is now available. This is a security and maintenance release for all versions since WordPress 3.7. WordPress versions 4.9 and earlier are affected by 4 security issues which could potentially be exploited as part of a multi-vector attack. As part of the core team's ongoing commitment to security hardening, the following fixes have been implemented in 4.9.1:

Use a properly generated hash for the newbloguser key instead of a determinate substring.
Add escaping to the language attributes used on HTML elements.
Ensure the attributes of enclosures are correctly escaped in RSS and Atom feeds.
Remove the ability to upload JavaScript files for users who do not have the unfiltered_html capability.

A small number of bugs have been identified which are impactful enough that the core team has decided to release 4.9.1 with fixes for those issues. Particularly of note were:

Issues relating to the caching of theme template files.
A MediaElement JavaScript error preventing users of certain languages from being able to upload media files.
The inability to edit theme and plugin files on Windows-based servers.

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The issues that have been fixed are:

#42573: File caching affecting users’ ability to use the plugin and theme file editors.
#42574: MediaElement upgrade causing JS errors when certain languages are in use.
#42579: Incorrect logic in extract_from_markers().
#42454: Unable to translate Codex URL in theme editor.
#42609: Theme editor cannot edit files when running on a Windows server.
#42628: flatten_dirlist() doesn’t play nice with folders with numeric names.
#42634: DB_HOST socket paths with colons not parsed correctly.
#42641: On multisite upgrade the wp_blog_versions table doesn’t get updated
#42673: Themes page throws console error when there is only one installed theme.
In addition, one fix for a bug introduced in WordPress 4.7 will be included in 4.9.1:
- #42242: lang attribute in the admin area doesn’t reflect a user’s language setting.