CVE-2021-39203 MEDIUM

CVE-2021-39203: Private data disclosure/privilege escalation through the block editor in Wordpress

Vendor Wordpress
Product wordpress-develop
Weakness CWE-200 · Info exposure
Published September 9, 2021
Last update August 4, 2024

CVSS base score

6.8/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

What the vulnerability does

01Description

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. In affected versions authenticated users who don't have permission to view private post types/data can bypass restrictions in the block editor under certain conditions. This affected WordPress 5.8 beta during the testing period. It's fixed in the final 5.8 release.

Explanation of Vulnerability in Simple Terms

02Summary

WordPress versions 5.8 beta 1 contain an information exposure vulnerability affecting the wordpress-develop product. An authenticated attacker with low privileges can read sensitive data and modify site content through a network-based attack that does not require user interaction. The vulnerability stems from improper access controls on certain operations.

What an attacker can do

03Attacker Capabilities

Read sensitive data and modify site content without higher-level permissions.

Potential impact on your site

04Site Impact

Low-privilege users (subscribers, contributors) can access and alter data they should not be able to reach.

Conditions required to exploit

05Prerequisites

Attacker must have a low-privilege WordPress account; network access to the site.

Key dates

06Disclosure timeline

September 9, 2021 CVE published
August 4, 2024 Record updated

Related vulnerabilities

08Related CVE