CVE-2026-89294
Description
The Simply Schedule Appointments plugin for WordPress is vulnerable to Local File Inclusion in all versions up to, and including, 1.6.12.27 via the 'ssa_locale' parameter parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to include and execute arbitrary .php files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where .php file types can be uploaded and included. Notably, exploitation does not require authentication in practice, as the locale filter is installed unconditionally on every request during plugins_loaded and the callback performs no nonce or capability check before returning the raw GET parameter value.
Affected WordPress components
-
Simply Schedule Appointments Plugin · simply-schedule-appointmentsUp to and including 1.6.12.27View on WordPress.org
A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.
Affected products and versions
- croixhaug Simply Schedule Appointments — Up to and including 1.6.12.27
References
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-translation.php#L108
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-translation.php#L50
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/class-translation.php#L67
- www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/aab8f2ae-993b-4893-81cc-1b8a1a4ef84b?source=cve
- nvd.nist.gov Official NVD record