{"id":"UBUNTU-CVE-2021-44223","details":"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.","modified":"2025-10-24T04:50:37Z","published":"2021-11-25T15:15:00Z","upstream":["CVE-2021-44223"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-44223"},{"type":"REPORT","url":"https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/"},{"type":"REPORT","url":"https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-44223"}],"affected":[{"package":{"name":"wordpress","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/wordpress@4.4.2+dfsg-1ubuntu1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3+dfsg-1","4.3.1+dfsg-1","4.4+dfsg-1","4.4.1+dfsg-1","4.4.2+dfsg-1","4.4.2+dfsg-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.4.2+dfsg-1ubuntu1","binary_name":"wordpress"},{"binary_version":"4.4.2+dfsg-1ubuntu1","binary_name":"wordpress-l10n"},{"binary_version":"4.4.2+dfsg-1ubuntu1","binary_name":"wordpress-theme-twentyfifteen"},{"binary_version":"4.4.2+dfsg-1ubuntu1","binary_name":"wordpress-theme-twentyfourteen"},{"binary_version":"4.4.2+dfsg-1ubuntu1","binary_name":"wordpress-theme-twentysixteen"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44223.json"}},{"package":{"name":"wordpress","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/wordpress@4.9.5+dfsg1-1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.2+dfsg-2","4.8.3+dfsg-1","4.9.1+dfsg-1","4.9.2+dfsg-1","4.9.4+dfsg-1","4.9.5+dfsg1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.9.5+dfsg1-1","binary_name":"wordpress"},{"binary_version":"4.9.5+dfsg1-1","binary_name":"wordpress-l10n"},{"binary_version":"4.9.5+dfsg1-1","binary_name":"wordpress-theme-twentyfifteen"},{"binary_version":"4.9.5+dfsg1-1","binary_name":"wordpress-theme-twentyseventeen"},{"binary_version":"4.9.5+dfsg1-1","binary_name":"wordpress-theme-twentysixteen"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44223.json"}},{"package":{"name":"wordpress","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/wordpress@5.3.2+dfsg1-1ubuntu1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.2+dfsg1-1","5.2.4+dfsg1-1","5.3.2+dfsg1-1","5.3.2+dfsg1-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.3.2+dfsg1-1ubuntu1","binary_name":"wordpress"},{"binary_version":"5.3.2+dfsg1-1ubuntu1","binary_name":"wordpress-l10n"},{"binary_version":"5.3.2+dfsg1-1ubuntu1","binary_name":"wordpress-theme-twentynineteen"},{"binary_version":"5.3.2+dfsg1-1ubuntu1","binary_name":"wordpress-theme-twentyseventeen"},{"binary_version":"5.3.2+dfsg1-1ubuntu1","binary_name":"wordpress-theme-twentysixteen"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44223.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}