CVE-2026-77203 | 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
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.
- 🔗 www.wordfence.com/threat-intel/vulnerabilities/id/e86dddc9-…
- 🔗 plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/views/class…
- 🔗 plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/views/class…
- 🔗 plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/views/class…
- 🔗 plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/wp/class-gr…
- 🔗 plugins.trac.wordpress.org/browser/groups/tags/4.5.0/lib/views/class…
- 🔗 plugins.trac.wordpress.org/changeset/3693123/groups
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📊 Historien-Charts — Criticals-Trend · Vendors · EPSS-Verteilung
| Tier | 2026-09-14 | 2026-09-27 |
|---|---|---|
| ≥90 % | 0 | 497 |
| ≥50 % | 0 | 1468 |
| ≥10 % | 0 | 4 |
| <10 % | 300 | 297 |
CVE-2026-77203 | 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
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 p
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