CVE-2021-39203 - CVE House
Back to Database
Status published Medium CVE-2021-39203

Private data disclosure/privilege escalation through the block editor in Wordpress

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-39203

Credits & Attribution

No credits recorded in the NVD database.

References

More from WordPress

View All →
CVE-2025-58674
WordPress <= 6.8.2 - (Author+) Cross Site Scripting (XSS) Vulnerability
Medium 5.9
CVE-2025-58246
WordPress <= 6.8.2 - (Contributor+) Sensitive Data Exposure Vulnerability
Medium 4.3
CVE-2025-54352
WordPress 3.5 through 6.8.2 allows remote attackers to guess titles...
Low 3.7
CVE-2024-31211
Remote Code Execution in `WP_HTML_Token`
Medium 5.5
CVE-2024-31210
PHP file upload bypass via Plugin installer
High 7.7

Affected Vendor

Affected Software

wordpress-develop
Vulnerable Versions:
5.8 beta 1

Timeline

Official Publish: September 9th, 2021
Last Modified: August 4th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Weaknesses (CWE)

CWE-200

MITRE ATT&CK TTPs

T1213 Data from Information Repositories
Collection
T1005 Data from Local System
Collection
T1552 Unsecured Credentials
Credential Access
T1041 Exfiltration Over C2 Channel
Exfiltration