What the vulnerability does
01Description
WordPress users with lower privileges (like contributors) can inject JavaScript code in the block editor using a specific payload, which is executed within the dashboard. This can lead to XSS if an admin opens the post in the editor. Execution of this attack does require an authenticated user. This has been patched in WordPress 5.3.1, along with all the previous WordPress versions from 3.7 to 5.3 via a minor release. Automatic updates are enabled by default for minor releases and we strongly recommend that you keep them enabled.
Explanation of Vulnerability in Simple Terms
02Summary
WordPress versions before 5.3.1 contain a cross-site scripting vulnerability in the block editor. An attacker with low-level site access can inject malicious scripts that execute in other users' browsers when they interact with affected content. The vulnerability requires user interaction and affects the confidentiality of user sessions and data.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other users' browsers to steal session data or perform actions on their behalf.
Potential impact on your site
04Site Impact
Compromised user accounts and data theft if contributors or editors are tricked into viewing malicious block content.
Conditions required to exploit
05Prerequisites
Attacker needs low-level WordPress account access; victim must interact with affected content in the editor.
Key dates
06Disclosure timeline
December 26, 2019
CVE published
August 5, 2024
Record updated
