CVE-2021-39203

Name: CVE-2021-39203
Creator: NVD / NIST
Published: 2021-09-09T22:15:09.683+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2021-39203 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.91%

55.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions	Update
Wordpress	Wordpress	5.8	Beta1

References

https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-qxvw-qxm9-qvg6Third Party Advisory
https://hackerone.com/reports/1225282Permissions Required
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-qxvw-qxm9-qvg6Third Party Advisory
https://hackerone.com/reports/1225282Permissions Required

Timeline

Published: Sep 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39203?

How severe is CVE-2021-39203?

CVE-2021-39203 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39203?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39203?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST