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WordPress 4.0.1 Released as Critical Security Update

WordPress has just released version 4.0.1 as a critical security update. Websites running on WordPress with auto update deactivated are advised to update their CMS as soon as possible. WordPress 4.0.1 fixes over 23 bugs  and 8 main security issues including better validation of EXIF data extracted  from uploaded photos.

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Version 4.0.1 does address these eight security issues (as reported on WP official release page):

  • Three cross-site scripting issues that a contributor or author could use to compromise a site. Discovered by Jon Cave, Robert Chapin, and John Blackbourn of the WordPress security team.
  • A cross-site request forgery that could be used to trick a user into changing their password.
  • An issue that could lead to a denial of service when passwords are checked. Reported by Javier Nieto Arevalo and Andres Rojas Guerrero.
  • Additional protections for server-side request forgery attacks when WordPress makes HTTP requests. Reported by Ben Bidner (vortfu).
  • An extremely unlikely hash collision could allow a user’s account to be compromised, that also required that they haven’t logged in since 2008 (I wish I were kidding). Reported by David Anderson.
  • WordPress now invalidates the links in a password reset email if the user remembers their password, logs in, and changes their email address. Reported separately by Momen Bassel, Tanoy Bose, and Bojan Slavković of ManageWP.
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