EUVD-2026-87787
GHSA-cm6x-39f7-w4rc
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable AJAX endpoint (AV:N), no special conditions (AC:L), requires a low-privilege Subscriber account (PR:L), no interaction (UI:N); escalation to Administrator yields full C/I/A impact.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
3DescriptionCVE.org
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 $post->post_author rather than from the currently authenticated user's own capabilities, while simultaneously minting and returning a valid groups-join-data hash and WordPress nonce for the caller in the same response - eliminating all authorization barriers to self-enrollment. This makes it possible for authenticated attackers, with Subscriber-level access and above, to enroll themselves into any group including privileged groups carrying the groups_admin_groups capability, and to subsequently create and join a group containing every registered WordPress capability, effectively escalating their privileges to Administrator. Exploitation requires the attacker to supply an Administrator-authored post ID via the post_ID parameter of the authenticated wp_ajax_parse_media_shortcode handler in order to establish the privileged ambient post context used by the flawed authorization check.
Articles & Coverage 1
AnalysisAI
Privilege escalation in the WordPress plugin Groups - Memberships and Access Control (itthinx) affects all versions up to and including 4.6.0, allowing any authenticated Subscriber-level user to self-enroll in arbitrary groups - including privileged admin groups - and ultimately mint a group that grants every registered WordPress capability, reaching Administrator. The root cause is an authorization check in groups_join() that reads the ambient post's author capabilities ($post->post_author) instead of the acting user's, while the same response hands the caller a valid join hash and nonce; an attacker only needs valid low-privilege credentials and the post ID of any Administrator-authored post, supplied via the post_ID parameter of the authenticated wp_ajax_parse_media_shortcode AJAX handler, with no victim interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated account of Subscriber level or above on a WordPress site running Groups - Memberships and Access Control ≤4.6.0 (self-registration is commonly enabled, making this a low bar). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue rather than a high-CVSS-but-low-real-risk one. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The authoritative fix is published as the upstream WordPress.org changeset 3693123 (https://plugins.trac.wordpress.org/changeset/3693123/groups), which corrects the groups_join() authorization logic; because this reference points to a repository changeset rather than a tagged release, treat the remediation as 'Upstream fix available (PR/commit); released patched version not independently confirmed' and verify the current plugin release on wordpress.org before upgrading - do not assume a specific version number beyond 4.6.0 without confirming it. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every WordPress instance running Groups - Memberships and Access Control and confirm whether it is version 4.6.0 or earlier; where the plugin is not business-critical, deactivate it immediately and, if it cannot be disabled, remove or tightly audit Subscriber-level accounts and block new self-registration. …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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