CVE-2021-39202

5.4 mediumEPSS 0.8%

Medium (5.4) in wordpress wordpress. EPSS 0.8% chance of exploitation in the next 30 days.

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. In affected versions the widgets editor introduced in WordPress 5.8 beta 1 has improper handling of HTML input in the Custom HTML feature. This leads to stored XSS in the custom HTML widget. This has been patched in WordPress 5.8. It was only present during the testing/beta phase of WordPress 5.8.

Severity

CVSS 3.1

5.4 medium

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

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2021-09-09
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

wordpress:wordpress

References

https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-fr6h-3855-j297
https://hackerone.com/reports/1222797
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-fr6h-3855-j297
https://hackerone.com/reports/1222797

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