Vulnerability · Published Sep 9, 2021 · Assigned by GitHub_M

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

Medium 6.8

In plain English

A medium-severity information exposure in wordpress-develop from WordPress. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.9%top 38.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:22.04:LTS	wordpress	no fix listed	UBUNTU-CVE-2021-39203
Ubuntu:24.04:LTS	wordpress	no fix listed	UBUNTU-CVE-2021-39203
Ubuntu:25.10	wordpress	no fix listed	UBUNTU-CVE-2021-39203
Ubuntu:26.04:LTS	wordpress	no fix listed	UBUNTU-CVE-2021-39203
Ubuntu:26.10	wordpress	no fix listed	UBUNTU-CVE-2021-39203

Affected products (as reported)

Vendor	Product	Versions
WordPress	wordpress-develop	5.8 beta 1

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

References

https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-qxvw-qxm9-qvg6 x_refsource_CONFIRM
https://hackerone.com/reports/1225282 x_refsource_MISC