CVE-2021-44223 WordPress before 5.8 lacks support for the Update URI plugin header.

What is CVE-2021-44223?

CVE-2021-44223 is a high-severity vulnerability in Wordpress Wordpress, published on 25 Nov 2021.

Official description

WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.

Which versions are affected by CVE-2021-44223?

2 open source packages ship an affected version, including wordpress and wordpress-multisite. It affects 1 product.

Products include Wordpress Wordpress.

How do I fix CVE-2021-44223?

Upgrade wordpress to 5.8.0 or later.

Is CVE-2021-44223 being exploited?

There is no known exploitation of CVE-2021-44223 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
• GitHub advisory
• How this page is made

Also known as BIT-wordpress-2021-44223, BIT-wordpress-multisite-2021-44223, DEBIAN-CVE-2021-44223, GHSA-m8cv-g4gv-cx2g, UBUNTU-CVE-2021-44223.