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The WordPress team has released a security update for WordPress version 5.0.1. This security release is for all versions since WordPress 3.7. It is strongly recommended to update your sites immediately to reduce the possibility of vulnerability exploitation.

Backward-compatibility changelog:

• Form element no longer passes KSES
• meta_input, file, and GUID inputs are ignored
• MIME validation for uploaded files

For more information about was changed or fixed, please visit the official 5.0.1 developer notes.

WordPress versions 5.0 and earlier are affected by the following bugs, which are fixed in version 5.0.1. Updated versions of WordPress 4.9 and older releases are also available, for users who have not yet updated to 5.0.

• Authors could alter metadata to delete files that they weren’t authorized to.
• Authors could create posts of unauthorized post types with specially crafted input.
• Contributors could craft metadata in a way that resulted in PHP object injection.
• Contributors could edit new comments from higher-privileged users, potentially leading to a cross-site scripting vulnerability.
• Specially crafted URL inputs could lead to a cross-site scripting vulnerability in some circumstances. WordPress itself was not affected, but plugins could be in some situations.
• The user activation screen could be indexed by search engines in some uncommon configurations, leading to exposure of email addresses, and in some rare cases, default generated passwords.
• Authors on Apache-hosted sites could upload specifically crafted files that bypass MIME verification, leading to a cross-site scripting vulnerability.

Make sure to download WordPress 5.0.1, or go to your Dashboard > Updates section and click Update Now. Sites that support automatic background updates are already beginning to update automatically.