CVE-2026-75983

The Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce plugin for WordPress is vulnerable to privilege escalation in all versions up to and including 4.1.23. Its PermissionManager::manage_permissions() function, hooked to WordPress core's map_meta_cap filter, unconditionally returns the always-true 'exist' primitive for every capability check whenever the evaluated user ID is 1, without scoping this to plugin-specific capabilities. An authenticated attacker who controls the site's user ID 1 account — even one demoted to Subscriber, a common administrator-account hardening practice — can therefore pass every capability check, including manage_options, edit_plugins, edit_themes, promote_users, and update_core, gaining administrator-equivalent power, full site takeover, and remote code execution via the plugin and theme editors. On default installations where user ID 1 retains the administrator role, no incremental privilege gain occurs, which explains the High attack-complexity CVSS 3.1 score of 7.5. No public proof of concept is known and the flaw is not listed in CISA's KEV catalog, so exploitation is currently considered none known.

What to do: Update Eventin to a version newer than 4.1.23 (the latest release) as soon as possible. If you use the 'demote user ID 1' hardening pattern, audit that account for signs of compromise and enforce a strong password plus two-factor authentication until patched. As a defense-in-depth measure against the plugin/theme editor RCE path, define DISALLOW_FILE_EDIT in wp-config.php.