CVE-2021-44223

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.

• https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/Release Notes, Vendor Advisory
• https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/Exploit, Third Party Advisory
• https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/Release Notes, Vendor Advisory
• https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/Exploit, Third Party Advisory

Published

Nov 25, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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