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Why was an update published?

WordPress versions 4.1.1 or earlier have been found to be vulnerable to cross-site scripting that could allow anonymous users to compromise a site. The WordPress security team discovered and fixed this issue. The update includes fixes for the following issues:

  • Files with invalid or unsafe names could be uploaded (WordPress 4.1 or higher). Discovered by Michael Kapfer and Sebastian kraemer of HSASec.
  • A limited cross-site scripting vulnerability could be used as part of a social engineering attack (WordPress 3.9 or higher). Discovered by Jakub Zoczek.
  • Some plugins that were vulnerable to SQL injection. Discovered by Ben Bidner of the WordPress security team.

Check out the official announcement at the WordPress.org site.

What should I do?

WordPress strongly encourages you to update your sites immediately. For more information on upgrading, check out Updating WordPress through the WordPress Administrator.

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