{"id":"CVE-2026-77203","published":"2026-09-26T18:16:29.917","lastModified":"2026-09-28T15:16:04.793","description":"The Groups – Memberships and Access Control plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.6.0. This is due to the groups_join() function deriving group-join eligibility from the ambient post's author capabilities via the global $post->post_author rather than from the currently authenticated user's own capabilities, while simultaneously minting and returning a valid groups-join-data hash and WordPress nonce for the caller in the same response — eliminating all authorization barriers to self-enrollment. This makes it possible for authenticated attackers, with Subscriber-level access and above, to enroll themselves into any group including privileged groups carrying the groups_admin_groups capability, and to subsequently create and join a group containing every registered WordPress capability, effectively escalating their privileges to Administrator. Exploitation requires the attacker to supply an Administrator-authored post ID via the post_ID parameter of the authenticated wp_ajax_parse_media_shortcode handler in order to establish the privileged ambient post context used by the flawed authorization check.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-269"],"vendors":[],"products":[],"references":[{"url":"https://plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/views/class-groups-shortcodes.php#L463","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/views/class-groups-shortcodes.php#L521","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/views/class-groups-shortcodes.php#L586","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/views/class-groups-shortcodes.php#L624","tags":[]},{"url":"https://plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/wp/class-groups-wordpress.php#L248","tags":[]},{"url":"https://plugins.trac.wordpress.org/changeset/3693123/groups","tags":[]},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/e86dddc9-c1d3-426b-8ec7-2e56dc3c2379?source=cve","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The flaw allows authenticated attackers with Subscriber-level access or higher to escalate their privileges to Administrator by exploiting a vulnerability in the Groups – Memberships and Access Control plugin for WordPress.","exploitability":"Exploitation requires the attacker to supply an Administrator-authored post ID, making it moderately hard to exploit. Precondition is the presence of the affected plugin version and an authenticated session with Subscriber-level access or higher.","blast_radius":"If exploited, the attacker can gain full administrative control over the WordPress site, potentially leading to data theft, unauthorized content changes, or complete site compromise.","remediation":"Disable the affected feature or upgrade to the latest version of the Groups – Memberships and Access Control plugin, specifically version 4.6.1 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","web","wp-plugin"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-30T09:03:58.401Z"}}