{"id":"UBUNTU-CVE-2026-3906","details":"WordPress core is vulnerable to unauthorized access in versions 6.9 through 6.9.1. The Notes feature (block-level collaboration annotations) was introduced in WordPress 6.9 to allow editorial comments directly on posts in the block editor. However, the REST API `create_item_permissions_check()` method in the comments controller did not verify that the authenticated user has `edit_post` permission on the target post when creating a note. This makes it possible for authenticated attackers with Subscriber-level access to create notes on any post, including posts authored by other users, private posts, and posts in any status.","modified":"2026-05-20T16:25:38.489121793Z","published":"2026-03-11T10:16:00Z","upstream":["CVE-2026-3906"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-3906"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-3906"},{"type":"REPORT","url":"https://core.trac.wordpress.org/changeset/61888"},{"type":"REPORT","url":"https://wordpress.org/news/2026/03/wordpress-6-9-2-release/"}],"affected":[{"package":{"name":"wordpress","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/wordpress?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_name":"wordpress","binary_version":"4.4.2+dfsg-1ubuntu1"},{"binary_version":"4.4.2+dfsg-1ubuntu1","binary_name":"wordpress-l10n"},{"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","binary_version":"4.4.2+dfsg-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3906.json"}},{"package":{"name":"wordpress","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/wordpress?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_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_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/2026/UBUNTU-CVE-2026-3906.json"}},{"package":{"name":"wordpress","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/wordpress?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_name":"wordpress","binary_version":"5.3.2+dfsg1-1ubuntu1"},{"binary_name":"wordpress-l10n","binary_version":"5.3.2+dfsg1-1ubuntu1"},{"binary_version":"5.3.2+dfsg1-1ubuntu1","binary_name":"wordpress-theme-twentynineteen"},{"binary_name":"wordpress-theme-twentyseventeen","binary_version":"5.3.2+dfsg1-1ubuntu1"},{"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/2026/UBUNTU-CVE-2026-3906.json"}},{"package":{"name":"wordpress","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/wordpress?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.7.1+dfsg1-2ubuntu1","5.8.1+dfsg1-2ubuntu1","5.8.2+dfsg1-1ubuntu1","5.8.3+dfsg1-1ubuntu1","5.8.3+dfsg1-1ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.8.3+dfsg1-1ubuntu1.1","binary_name":"wordpress"},{"binary_name":"wordpress-l10n","binary_version":"5.8.3+dfsg1-1ubuntu1.1"},{"binary_name":"wordpress-theme-twentynineteen","binary_version":"5.8.3+dfsg1-1ubuntu1.1"},{"binary_version":"5.8.3+dfsg1-1ubuntu1.1","binary_name":"wordpress-theme-twentytwenty"},{"binary_version":"5.8.3+dfsg1-1ubuntu1.1","binary_name":"wordpress-theme-twentytwentyone"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3906.json"}},{"package":{"name":"wordpress","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/wordpress?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.2+dfsg1-1ubuntu1","6.4.3+dfsg1-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"wordpress","binary_version":"6.4.3+dfsg1-1ubuntu1"},{"binary_version":"6.4.3+dfsg1-1ubuntu1","binary_name":"wordpress-l10n"},{"binary_name":"wordpress-theme-twentytwentyfour","binary_version":"6.4.3+dfsg1-1ubuntu1"},{"binary_version":"6.4.3+dfsg1-1ubuntu1","binary_name":"wordpress-theme-twentytwentythree"},{"binary_name":"wordpress-theme-twentytwentytwo","binary_version":"6.4.3+dfsg1-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3906.json"}},{"package":{"name":"wordpress","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/wordpress?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.7.2+dfsg1-1.1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"wordpress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