Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin: Sensitive information exposure
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin is affected by sensitive information exposure. The vulnerable path is reachable without authentication. Successful exploitation can disclose data that should not be available to the caller.
- Component
- Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
- Affected
- See vendor advisory
- Safe version
- See mitigation notes
- Published
- Jan 06, 2026
This CVE was published Jan 06, 2026 and is one of 3 known issues for this plugin.
Update, patch or deactivate.
Update Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin to a release outside the affected range, or disable and remove it until a fixed version is available.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.6.9.5 via the hash() function due to use of a hardcoded fall-back salt. This makes it possible for unauthenticated attackers to generate a valid token across sites running the plugin that have not manually set a salt in the wp-config.php file and access booking information that will allow them to make modifications.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N