Nov 8, 2018

Multiple Critical Vulnerabilities in WordPress Core. Upgrade to 4.0.1 Immediately

WordPress 4.0.1 has just been released which includes the announcement of multiple critical vulnerabilities in WordPress core including version 4.0. 

Upgrade to WordPress 4.0.1 immediately if you haven't already which fixes these issues. 


WordPress 4.0 is affected by the following vulnerabilities which have been fixed in 4.0.1:
  • Three cross-site scripting issues that a contributor or author could use to compromise a site.
  • 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.
  • Additional protections for server-side request forgery attacks when WordPress makes HTTP requests.
  • 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.
  • WordPress now invalidates the links in a password reset email if the user remembers their password, logs in, and changes their email address.
  • Version 4.0.1 also fixes 23 bugs with 4.0, and makes two hardening changes, including better validation of EXIF data extracted from uploaded photos.