CVE-2021-39202 WordPress 5.8 beta: Stored Cross-Site Scripting (XSS) vulnerability in widget

What is CVE-2021-39202?

CVE-2021-39202 is a high-severity vulnerability in Wordpress Wordpress, published on 9 Sep 2021.

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 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.

Weakness: CWE-79

Which versions are affected by CVE-2021-39202?

It affects 1 product.

Products include Wordpress Wordpress.

How do I fix CVE-2021-39202?

No fix has been published for CVE-2021-39202 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-39202 being exploited?

There is no known exploitation of CVE-2021-39202 in the wild and no public exploit code.

Other vulnerabilities in Wordpress Wordpress

• CVE-2026-63030 WordPress Core Interpretation Conflict Exploited Critical 9.8
• CVE-2026-87902 WordPress Core Remote File Inclusion Exploited High 8.1
• CVE-2026-60137 WordPress Core SQL Injection Exploited Medium 5.9
• CVE-2012-2399 Cross-site scripting in n/a Critical 10.0
• CVE-2012-2400 Other in n/a Critical 10.0

All Wordpress Wordpress vulnerabilities

Sources

• CVE record
• NVD
• OSV
• How this page is made

Also known as UBUNTU-CVE-2021-39202.