CVE-2021-39203 json
Private data disclosure/privilege escalation through the block editor in Wordpress
published 2021-09-09 5 y ago modified 2026-06-17 4 mo ago also BIT-wordpress-multisite-2021-39203 , EUVD-2021-25585 , GHSA-qxvw-qxm9-qvg6
- cvss
- 6.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
0.94% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 6.0 | AV:N/AC:M/Au:S/C:P/I:P/A:P |
Affected products
- WordPress wordpress-develop
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
- Technology feeds
References
-
github.com
/WordPress/wordpress-develop/security/advisories/GHSA-qxvw-qxm9-qvg6
third-party-advisory, advisory
-
hackerone.com
/reports/1225282
permissions-required
Sources
- CVE List CVE-2021-39203
- NVD CVE-2021-39203
- OSV BIT-wordpress-multisite-2021-39203
- Maintainer advisory GHSA-qxvw-qxm9-qvg6
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of WordPress/wordpress-develop published their own advisory on GitHub. Reviewed sources take precedence over it.