CVE-2026-84906

The Eventin plugin for WordPress up to version 4.1.23 is vulnerable to privilege escalation. The PermissionManager::manage_permissions() function is registered as a callback on WordPress core's map_meta_cap filter and unconditionally returns the always-true 'exist' primitive for every capability check whenever the evaluated user ID is 1, without scoping to plugin-specific capabilities. This allows authenticated attackers with user ID 1, even subscribers, to pass every WordPress capability check, including manage_options, edit_plugins, edit_themes, promote_users, and update_core, leading to full site takeover and remote code execution. Exploitation is only impactful when user ID 1 has been deliberately demoted to a lower-privilege role; on default installations where user ID 1 retains the administrator role, no incremental privilege gain occurs.

The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'etn_shedule_objective' schedule_slot parameter in all versions up to and including 4.1.23 due to insufficient input sanitization and output escaping. An authenticated attacker with contributor-level access or above can inject arbitrary web scripts into pages that execute when a user accesses the injected page.

The Eventin WordPress plugin before 4.1.21 does not verify ownership before allowing schedule records to be modified or deleted, allowing users with contributor-level access and above to alter or delete schedule entries created by other users.

The Eventin WordPress plugin before 4.1.21 does not verify ownership or capability before deleting user accounts, allowing users with contributor-level access and above to permanently delete other users' accounts.

The Eventin WordPress plugin before 4.1.21 does not verify the current user's permission to edit other users before assigning roles and updating user metadata during speaker creation, allowing users with contributor-level access and above to modify other users' roles and metadata.

The Eventin WordPress plugin before 4.1.21 does not properly verify ownership of events before allowing them to be modified, deleted, or reassigned to a different author, allowing users with contributor-level access and above to alter, delete, or take over events created by other users including administrators.

The Eventin WordPress plugin before version 4.1.20 does not properly validate a template path setting before using it to include a local file, allowing users with editor-level access and above to include and execute arbitrary local PHP files.